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This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. Unlimited file parts can use up memory and file handles. If many concurrent requests are sent continuously, this can exhaust or kill all available workers. 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If an upload of a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. This vulnerability has been patched in version 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Browsers may allow \"nameless\" cookies that look like `=value` instead of `key=value`. A vulnerable browser may allow a compromised application on an adjacent subdomain to exploit this to set a cookie like `=__Host-test=bad` for another subdomain. Werkzeug prior to 2.2.3 will parse the cookie `=__Host-test=bad` as __Host-test=bad`. If a Werkzeug application is running next to a vulnerable or malicious subdomain which sets such a cookie using a vulnerable browser, the Werkzeug application will see the bad cookie value but the valid cookie key. The issue is fixed in Werkzeug 2.2.3.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-23934.json","reference_id":"","reference_type":"","scores":[{"value":"2.6","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-23934.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2023-23934","reference_id":"","reference_type":"","scores":[{"value":"0.00267","scoring_system":"epss","scoring_elements":"0.50334","published_at":"2026-06-04T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2023-23934"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"2.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/pallets/werkzeug","reference_id":"","reference_type":"","scores":[{"value":"2.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pallets/werkzeug"},{"reference_url":"https://github.com/pallets/werkzeug/commit/cf275f42acad1b5950c50ffe8ef58fe62cdce028","reference_id":"","reference_type":"","scores":[{"value":"2.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"},{"value":"LOW","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/2025-03-10T20:57:36Z/"}],"url":"https://github.com/pallets/werkzeug/commit/cf275f42acad1b5950c50ffe8ef58fe62cdce028"},{"reference_url":"https://github.com/pallets/werkzeug/releases/tag/2.2.3","reference_id":"","reference_type":"","scores":[{"value":"2.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"},{"value":"LOW","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/2025-03-10T20:57:36Z/"}],"url":"https://github.com/pallets/werkzeug/releases/tag/2.2.3"},{"reference_url":"https://github.com/pallets/werkzeug/security/advisories/GHSA-px8h-6qxv-m22q","reference_id":"","reference_type":"","scores":[{"value":"2.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"},{"value":"LOW","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/2025-03-10T20:57:36Z/"}],"url":"https://github.com/pallets/werkzeug/security/advisories/GHSA-px8h-6qxv-m22q"},{"reference_url":"https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-57.yaml","reference_id":"","reference_type":"","scores":[{"value":"2.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-57.yaml"},{"reference_url":"https://security.netapp.com/advisory/ntap-20230818-0003","reference_id":"","reference_type":"","scores":[{"value":"2.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://security.netapp.com/advisory/ntap-20230818-0003"},{"reference_url":"https://www.debian.org/security/2023/dsa-5470","reference_id":"","reference_type":"","scores":[{"value":"2.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"},{"value":"LOW","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/2025-03-10T20:57:36Z/"}],"url":"https://www.debian.org/security/2023/dsa-5470"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1031370","reference_id":"1031370","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1031370"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2170243","reference_id":"2170243","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2170243"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2023-23934","reference_id":"CVE-2023-23934","reference_type":"","scores":[{"value":"2.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-23934"},{"reference_url":"https://github.com/advisories/GHSA-px8h-6qxv-m22q","reference_id":"GHSA-px8h-6qxv-m22q","reference_type":"","scores":[],"url":"https://github.com/advisories/GHSA-px8h-6qxv-m22q"},{"reference_url":"https://security.netapp.com/advisory/ntap-20230818-0003/","reference_id":"ntap-20230818-0003","reference_type":"","scores":[{"value":"2.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-03-10T20:57:36Z/"}],"url":"https://security.netapp.com/advisory/ntap-20230818-0003/"},{"reference_url":"https://access.redhat.com/errata/RHSA-2023:1018","reference_id":"RHSA-2023:1018","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2023:1018"},{"reference_url":"https://access.redhat.com/errata/RHSA-2025:4664","reference_id":"RHSA-2025:4664","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2025:4664"},{"reference_url":"https://access.redhat.com/errata/RHSA-2025:9775","reference_id":"RHSA-2025:9775","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2025:9775"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/31505?format=json","purl":"pkg:pypi/werkzeug@2.2.3","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-534z-9duh-c7ck"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/werkzeug@2.2.3"}],"aliases":["CVE-2023-23934","GHSA-px8h-6qxv-m22q","PYSEC-2023-57"],"risk_score":1.4,"exploitability":"0.5","weighted_severity":"2.7","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-w1k4-6zvd-8yhb"}],"fixing_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/36095?format=json","vulnerability_id":"VCID-4j9n-99ub-93bh","summary":"** DISPUTED ** Improper parsing of HTTP requests in Pallets Werkzeug v2.1.0 and below allows attackers to perform HTTP Request Smuggling using a crafted HTTP request with multiple requests included inside the body. NOTE: the vendor's position is that this behavior can only occur in unsupported configurations involving development mode and an HTTP server from outside the Werkzeug project.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2022-29361.json","reference_id":"","reference_type":"","scores":[],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2022-29361.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2022-29361","reference_id":"","reference_type":"","scores":[{"value":"0.31113","scoring_system":"epss","scoring_elements":"0.96841","published_at":"2026-06-04T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2022-29361"},{"reference_url":"https://github.com/pallets/werkzeug/commit/9a3a981d70d2e9ec3344b5192f86fcaf3210cd85","reference_id":"","reference_type":"","scores":[],"url":"https://github.com/pallets/werkzeug/commit/9a3a981d70d2e9ec3344b5192f86fcaf3210cd85"},{"reference_url":"https://github.com/pallets/werkzeug/issues/2420","reference_id":"","reference_type":"","scores":[],"url":"https://github.com/pallets/werkzeug/issues/2420"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2253045","reference_id":"2253045","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2253045"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2022-29361","reference_id":"CVE-2022-29361","reference_type":"","scores":[],"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-29361"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/27779?format=json","purl":"pkg:pypi/werkzeug@2.1.1","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-4vhn-jq7h-9qg2"},{"vulnerability":"VCID-534z-9duh-c7ck"},{"vulnerability":"VCID-w1k4-6zvd-8yhb"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/werkzeug@2.1.1"}],"aliases":["CVE-2022-29361","PYSEC-2022-203"],"risk_score":0.1,"exploitability":"0.5","weighted_severity":"0.3","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-4j9n-99ub-93bh"}],"risk_score":"4.0","resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/werkzeug@2.1.1"}