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Although this behavior is not specified in the section for redirects, it can be inferred by piecing together information from different sections and we have observed the behavior in other major HTTP client implementations like curl and web browsers. Because the vulnerability requires a previously trusted service to become compromised in order to have an impact on confidentiality we believe the exploitability of this vulnerability is low. Additionally, many users aren't putting sensitive data in HTTP request bodies, if this is the case then this vulnerability isn't exploitable. Both of the following conditions must be true to be affected by this vulnerability: 1. Using urllib3 and submitting sensitive information in the HTTP request body (such as form data or JSON) and 2. The origin service is compromised and starts redirecting using 301, 302, or 303 to a malicious peer or the redirected-to service becomes compromised. This issue has been addressed in versions 1.26.18 and 2.0.7 and users are advised to update to resolve this issue. Users unable to update should disable redirects for services that aren't expecting to respond with redirects with `redirects=False` and disable automatic redirects with `redirects=False` and handle 301, 302, and 303 redirects manually by stripping the HTTP request 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Proxy-Authorization request header isn't stripped during cross-origin redirects\nWhen using urllib3's proxy support with `ProxyManager`, the `Proxy-Authorization` header is only sent to the configured proxy, as expected.\n\nHowever, when sending HTTP requests *without* using urllib3's proxy support, it's possible to accidentally configure the `Proxy-Authorization` header even though it won't have any effect as the request is not using a forwarding proxy or a tunneling proxy. In those cases, urllib3 doesn't treat the `Proxy-Authorization` HTTP header as one carrying authentication material and thus doesn't strip the header on cross-origin redirects.\n\nBecause this is a highly unlikely scenario, we believe the severity of this vulnerability is low for almost all users. Out of an abundance of caution urllib3 will automatically strip the `Proxy-Authorization` header during cross-origin redirects to avoid the small chance that users are doing this on accident.\n\nUsers should use urllib3's proxy support or disable automatic redirects to achieve safe processing of the `Proxy-Authorization` header, but we still decided to strip the header by default in order to further protect users who aren't using the correct approach.\n\n## Affected usages\n\nWe believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited:\n\n* Setting the `Proxy-Authorization` header without using urllib3's built-in proxy support.\n* Not disabling HTTP redirects.\n* Either not using an HTTPS origin server or for the proxy or target origin to redirect to a malicious origin.\n\n## Remediation\n\n* Using the `Proxy-Authorization` header with urllib3's `ProxyManager`.\n* Disabling HTTP redirects using `redirects=False` when sending requests.\n* Not using the `Proxy-Authorization` 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_encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-7212.json","reference_id":"","reference_type":"","scores":[],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-7212.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2020-7212","reference_id":"","reference_type":"","scores":[{"value":"0.00677","scoring_system":"epss","scoring_elements":"0.7149","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00677","scoring_system":"epss","scoring_elements":"0.71551","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00677","scoring_system":"epss","scoring_elements":"0.71504","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00677","scoring_system":"epss","scoring_elements":"0.71523","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00677","scoring_system":"epss","scoring_elements":"0.71538","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00677","scoring_system":"epss","scoring_elements":"0.71516","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00677","scoring_system":"epss","scoring_elements":"0.71503","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00677","scoring_system":"epss","scoring_elements":"0.71463","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00677","scoring_system":"epss","scoring_elements":"0.71466","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00677","scoring_system":"epss","scoring_elements":"0.71473","published_at":"2026-04-02T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2020-7212"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-7212","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-7212"},{"reference_url":"https://github.com/advisories/GHSA-hmv2-79q8-fv6g","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"8.7","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-hmv2-79q8-fv6g"},{"reference_url":"https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-149.yaml","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.7","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-149.yaml"},{"reference_url":"https://github.com/urllib3/urllib3","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.7","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/urllib3/urllib3"},{"reference_url":"https://github.com/urllib3/urllib3/blob/master/CHANGES.rst","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.7","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/urllib3/urllib3/blob/master/CHANGES.rst"},{"reference_url":"https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.7","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2020-7212","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.7","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-7212"},{"reference_url":"https://pypi.org/project/urllib3/1.25.8","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system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redirects are not disabled when retries are disabled on PoolManager instantiation\nurllib3 handles redirects and retries using the same mechanism, which is controlled by the `Retry` object. The most common way to disable redirects is at the request level, as follows:\n\n```python\nresp = urllib3.request(\"GET\", \"https://httpbin.org/redirect/1\", redirect=False)\nprint(resp.status)\n# 302\n```\n\nHowever, it is also possible to disable redirects, for all requests, by instantiating a `PoolManager` and specifying `retries` in a way that disable redirects:\n\n```python\nimport urllib3\n\nhttp = urllib3.PoolManager(retries=0)  # should raise MaxRetryError on redirect\nhttp = urllib3.PoolManager(retries=urllib3.Retry(redirect=0))  # equivalent to the above\nhttp = urllib3.PoolManager(retries=False)  # should return the first response\n\nresp = http.request(\"GET\", \"https://httpbin.org/redirect/1\")\n```\n\nHowever, the `retries` parameter is currently ignored, which means all the above examples don't disable redirects.\n\n## Affected usages\n\nPassing `retries` on `PoolManager` instantiation to disable redirects or restrict their number.\n\nBy default, requests and botocore users are not affected.\n\n## Impact\n\nRedirects are often used to exploit SSRF vulnerabilities. An application attempting to mitigate SSRF or open redirect vulnerabilities by disabling redirects at the PoolManager level will remain vulnerable.\n\n## Remediation\n\nYou can remediate this vulnerability with the following steps:\n\n * Upgrade to a patched version of urllib3. If your organization would benefit from the continued support of urllib3 1.x, please contact [sethmichaellarson@gmail.com](mailto:sethmichaellarson@gmail.com) to discuss sponsorship or contribution opportunities.\n * Disable redirects at the `request()` level instead of the `PoolManager()` level.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-50181.json","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-50181.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2025-50181","reference_id":"","reference_type":"","scores":[{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07158","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07109","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00028","scoring_system":"epss","scoring_elements":"0.07921","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00028","scoring_system":"epss","scoring_elements":"0.07951","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00028","scoring_system":"epss","scoring_elements":"0.07963","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00028","scoring_system":"epss","scoring_elements":"0.07942","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00028","scoring_system":"epss","scoring_elements":"0.07885","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00028","scoring_system":"epss","scoring_elements":"0.07934","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00079","scoring_system":"epss","scoring_elements":"0.23398","published_at":"2026-04-16T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2025-50181"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-50181","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-50181"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/urllib3/urllib3","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/urllib3/urllib3"},{"reference_url":"https://github.com/urllib3/urllib3/commit/f05b1329126d5be6de501f9d1e3e36738bc08857","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-06-23T16:45:50Z/"}],"url":"https://github.com/urllib3/urllib3/commit/f05b1329126d5be6de501f9d1e3e36738bc08857"},{"reference_url":"https://github.com/urllib3/urllib3/releases/tag/2.5.0","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-06-23T16:45:50Z/"}],"url":"https://github.com/urllib3/urllib3/releases/tag/2.5.0"},{"reference_url":"https://github.com/urllib3/urllib3/security/advisories/GHSA-pq67-6m6q-mj2v","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-06-23T16:45:50Z/"}],"url":"https://github.com/urllib3/urllib3/security/advisories/GHSA-pq67-6m6q-mj2v"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2025-50181","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-50181"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1108076","reference_id":"1108076","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1108076"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2373799","reference_id":"2373799","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2373799"},{"reference_url":"https://github.com/advisories/GHSA-pq67-6m6q-mj2v","reference_id":"GHSA-pq67-6m6q-mj2v","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-pq67-6m6q-mj2v"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:4215","reference_id":"RHSA-2026:4215","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:4215"},{"reference_url":"https://usn.ubuntu.com/7599-1/","reference_id":"USN-7599-1","reference_type":"","scores":[],"url":"https://usn.ubuntu.com/7599-1/"},{"reference_url":"https://usn.ubuntu.com/7599-2/","reference_id":"USN-7599-2","reference_type":"","scores":[],"url":"https://usn.ubuntu.com/7599-2/"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/70769?format=json","purl":"pkg:pypi/urllib3@2.5.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-kjka-a931-uygj"},{"vulnerability":"VCID-v365-pn8r-e7dh"},{"vulnerability":"VCID-zevs-1ge5-y7g7"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/urllib3@2.5.0"}],"aliases":["CVE-2025-50181","GHSA-pq67-6m6q-mj2v"],"risk_score":3.1,"exploitability":"0.5","weighted_severity":"6.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-7wcj-zvjq-xud3"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/6481?format=json","vulnerability_id":"VCID-8par-whwz-6kft","summary":"An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP 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is a user-friendly HTTP client library for Python. urllib3 doesn't treat the `Cookie` HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. 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This issue has been patched in urllib3 version 1.26.17 or 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before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE: this is similar to CVE-2020-26116.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-26137.json","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-26137.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2020-26137","reference_id":"","reference_type":"","scores":[{"value":"0.00277","scoring_system":"epss","scoring_elements":"0.51195","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00277","scoring_system":"epss","scoring_elements":"0.51156","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00277","scoring_system":"epss","scoring_elements":"0.51061","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00277","scoring_system":"epss","scoring_elements":"0.51171","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00277","scoring_system":"epss","scoring_elements":"0.51193","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00277","scoring_system":"epss","scoring_elements":"0.51149","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00277","scoring_system":"epss","scoring_elements":"0.51152","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00277","scoring_system":"epss","scoring_elements":"0.51097","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00277","scoring_system":"epss","scoring_elements":"0.51139","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00277","scoring_system":"epss","scoring_elements":"0.51115","published_at":"2026-04-02T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2020-26137"},{"reference_url":"https://bugs.python.org/issue39603","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://bugs.python.org/issue39603"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26137","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26137"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"5.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/advisories/GHSA-wqvq-5m8c-6g24","reference_id":"","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-wqvq-5m8c-6g24"},{"reference_url":"https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-148.yaml","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-148.yaml"},{"reference_url":"https://github.com/urllib3/urllib3","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/urllib3/urllib3"},{"reference_url":"https://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436b","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436b"},{"reference_url":"https://github.com/urllib3/urllib3/pull/1800","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/urllib3/urllib3/pull/1800"},{"reference_url":"https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html"},{"reference_url":"https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26137","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26137"},{"reference_url":"https://usn.ubuntu.com/4570-1","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://usn.ubuntu.com/4570-1"},{"reference_url":"https://usn.ubuntu.com/4570-1/","reference_id":"","reference_type":"","scores":[],"url":"https://usn.ubuntu.com/4570-1/"},{"reference_url":"https://www.oracle.com/security-alerts/cpujul2022.html","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.oracle.com/security-alerts/cpujul2022.html"},{"reference_url":"https://www.oracle.com/security-alerts/cpuoct2021.html","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.oracle.com/security-alerts/cpuoct2021.html"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=1883632","reference_id":"1883632","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1883632"},{"reference_url":"https://access.redhat.com/errata/RHSA-2020:4299","reference_id":"RHSA-2020:4299","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2020:4299"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:0034","reference_id":"RHSA-2021:0034","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:0034"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:0079","reference_id":"RHSA-2021:0079","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:0079"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:1631","reference_id":"RHSA-2021:1631","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:1631"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:1761","reference_id":"RHSA-2021:1761","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:1761"},{"reference_url":"https://access.redhat.com/errata/RHSA-2022:5235","reference_id":"RHSA-2022:5235","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2022:5235"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/13447?format=json","purl":"pkg:pypi/urllib3@1.25.9","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-4evk-srqq-fuef"},{"vulnerability":"VCID-5tkp-pxz9-h7c2"},{"vulnerability":"VCID-7wcj-zvjq-xud3"},{"vulnerability":"VCID-8par-whwz-6kft"},{"vulnerability":"VCID-969r-9mvk-uyh4"},{"vulnerability":"VCID-kjka-a931-uygj"},{"vulnerability":"VCID-v365-pn8r-e7dh"},{"vulnerability":"VCID-zevs-1ge5-y7g7"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/urllib3@1.25.9"}],"aliases":["CVE-2020-26137","GHSA-wqvq-5m8c-6g24","PYSEC-2020-148"],"risk_score":3.1,"exploitability":"0.5","weighted_severity":"6.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-gxkt-bvtg-gbaj"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/20200?format=json","vulnerability_id":"VCID-kjka-a931-uygj","summary":"Decompression-bomb safeguards bypassed when following HTTP redirects (streaming API)\n### Impact\n\nurllib3's [streaming API](https://urllib3.readthedocs.io/en/2.6.2/advanced-usage.html#streaming-and-i-o) is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once.\n\nurllib3 can perform decoding or decompression based on the HTTP `Content-Encoding` header (e.g., `gzip`, `deflate`, `br`, or `zstd`). When using the streaming API, the library decompresses only the necessary bytes, enabling partial content consumption.\n\nHowever, for HTTP redirect responses, the library would read the entire response body to drain the connection and decompress the content unnecessarily. This decompression occurred even before any read methods were called, and configured read limits did not restrict the amount of decompressed data. As a result, there was no safeguard against decompression bombs. A malicious server could exploit this to trigger excessive resource consumption on the client (high CPU usage and large memory allocations for decompressed data; CWE-409).\n\n### Affected usages\n\nApplications and libraries using urllib3 version 2.6.2 and earlier to stream content from untrusted sources by setting `preload_content=False` when they do not disable redirects.\n\n\n### Remediation\n\nUpgrade to at least urllib3 v2.6.3 in which the library does not decode content of redirect responses when `preload_content=False`.\n\nIf upgrading is not immediately possible, disable [redirects](https://urllib3.readthedocs.io/en/2.6.2/user-guide.html#retrying-requests) by setting `redirect=False` for requests to untrusted source.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-21441.json","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-21441.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-21441","reference_id":"","reference_type":"","scores":[{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07527","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07602","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07616","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07629","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.0761","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07535","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07575","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07552","published_at":"2026-04-07T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-21441"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21441","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21441"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"4.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/urllib3/urllib3","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/urllib3/urllib3"},{"reference_url":"https://github.com/urllib3/urllib3/commit/8864ac407bba8607950025e0979c4c69bc7abc7b","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-01-08T20:08:04Z/"}],"url":"https://github.com/urllib3/urllib3/commit/8864ac407bba8607950025e0979c4c69bc7abc7b"},{"reference_url":"https://github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"8.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-01-08T20:08:04Z/"}],"url":"https://github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99"},{"reference_url":"https://lists.debian.org/debian-lts-announce/2026/01/msg00017.html","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.debian.org/debian-lts-announce/2026/01/msg00017.html"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21441","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21441"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1125062","reference_id":"1125062","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugr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