{"url":"http://public2.vulnerablecode.io/api/packages/71008?format=json","purl":"pkg:pypi/flask@3.1.1","type":"pypi","namespace":"","name":"flask","version":"3.1.1","qualifiers":{},"subpath":"","is_vulnerable":true,"next_non_vulnerable_version":"3.1.3","latest_non_vulnerable_version":"3.1.3","affected_by_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/21000?format=json","vulnerability_id":"VCID-rx8q-6dwq-a3hs","summary":"Flask session does not add `Vary: Cookie` header when accessed in some ways\nWhen the `session` object is accessed, Flask should set the `Vary: Cookie` header. This instructs caches not to cache the response, as it may contain information specific to a logged in user. This is handled in most cases, but some forms of access such as the Python `in` operator were overlooked.\n\nThe severity depends on the application's use of the session, and the cache's behavior regarding cookies. The risk depends on all these conditions being met.\n\n1. The application must be hosted behind a caching proxy that does not ignore responses with cookies.\n2. The application does not set a `Cache-Control` header to indicate that a page is private or should not be cached.\n3. The application accesses the session in a way that does not access the values, only the keys, and does not mutate the session.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27205.json","reference_id":"","reference_type":"","scores":[{"value":"4.3","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27205.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-27205","reference_id":"","reference_type":"","scores":[{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.01441","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.01344","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.01454","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.0135","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.0136","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.01365","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.01364","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.01353","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.01347","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.01349","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.01338","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.01432","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.01445","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00013","scoring_system":"epss","scoring_elements":"0.02014","published_at":"2026-05-12T12:55:00Z"},{"value":"0.00013","scoring_system":"epss","scoring_elements":"0.02024","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00013","scoring_system":"epss","scoring_elements":"0.0204","published_at":"2026-05-11T12:55:00Z"},{"value":"0.00013","scoring_system":"epss","scoring_elements":"0.02039","published_at":"2026-05-09T12:55:00Z"},{"value":"0.00013","scoring_system":"epss","scoring_elements":"0.02015","published_at":"2026-05-07T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-27205"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-27205","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-27205"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.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:R/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/pallets/flask","reference_id":"","reference_type":"","scores":[{"value":"2.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pallets/flask"},{"reference_url":"https://github.com/pallets/flask/commit/089cb86dd22bff589a4eafb7ab8e42dc357623b4","reference_id":"","reference_type":"","scores":[{"value":"2.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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/2026-02-24T19:02:52Z/"}],"url":"https://github.com/pallets/flask/commit/089cb86dd22bff589a4eafb7ab8e42dc357623b4"},{"reference_url":"https://github.com/pallets/flask/releases/tag/3.1.3","reference_id":"","reference_type":"","scores":[{"value":"2.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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/2026-02-24T19:02:52Z/"}],"url":"https://github.com/pallets/flask/releases/tag/3.1.3"},{"reference_url":"https://github.com/pallets/flask/security/advisories/GHSA-68rp-wp8r-4726","reference_id":"","reference_type":"","scores":[{"value":"LOW","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"2.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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/2026-02-24T19:02:52Z/"}],"url":"https://github.com/pallets/flask/security/advisories/GHSA-68rp-wp8r-4726"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27205","reference_id":"","reference_type":"","scores":[{"value":"2.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27205"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1128620","reference_id":"1128620","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1128620"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2441596","reference_id":"2441596","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2441596"},{"reference_url":"https://github.com/advisories/GHSA-68rp-wp8r-4726","reference_id":"GHSA-68rp-wp8r-4726","reference_type":"","scores":[{"value":"LOW","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-68rp-wp8r-4726"},{"reference_url":"https://usn.ubuntu.com/8104-1/","reference_id":"USN-8104-1","reference_type":"","scores":[],"url":"https://usn.ubuntu.com/8104-1/"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/63007?format=json","purl":"pkg:pypi/flask@3.1.3","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/flask@3.1.3"}],"aliases":["CVE-2026-27205","GHSA-68rp-wp8r-4726"],"risk_score":1.9,"exploitability":"0.5","weighted_severity":"3.9","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-rx8q-6dwq-a3hs"}],"fixing_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/30244?format=json","vulnerability_id":"VCID-ypj9-hez8-qbcs","summary":"Flask uses fallback key instead of current signing key\nIn Flask 3.1.0, the way fallback key configuration was handled resulted in the last fallback key being used for signing, rather than the current signing key.\n\nSigning is provided by the `itsdangerous` library. A list of keys can be passed, and it expects the last (top) key in the list to be the most recent key, and uses that for signing. Flask was incorrectly constructing that list in reverse, passing the signing key first.\n\nSites that have opted-in to use key rotation by setting `SECRET_KEY_FALLBACKS` are likely to unexpectedly be signing their sessions with stale keys, and their transition to fresher keys will be impeded. Sessions are still signed, so this would not cause any sort of data integrity loss.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-47278.json","reference_id":"","reference_type":"","scores":[{"value":"2.3","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-47278.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2025-47278","reference_id":"","reference_type":"","scores":[{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28141","published_at":"2026-05-12T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28122","published_at":"2026-05-11T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28204","published_at":"2026-05-09T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28181","published_at":"2026-05-07T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28123","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28284","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.2836","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28472","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28731","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28622","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28687","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28726","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28768","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28585","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28634","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28659","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28815","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00106","scoring_system":"epss","scoring_elements":"0.28639","published_at":"2026-04-13T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2025-47278"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"1.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/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/pallets/flask","reference_id":"","reference_type":"","scores":[{"value":"1.8","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pallets/flask"},{"reference_url":"https://github.com/pallets/flask/commit/73d6504063bfa00666a92b07a28aaf906c532f09","reference_id":"","reference_type":"","scores":[{"value":"1.8","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA: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/2025-05-13T20:13:56Z/"}],"url":"https://github.com/pallets/flask/commit/73d6504063bfa00666a92b07a28aaf906c532f09"},{"reference_url":"https://github.com/pallets/flask/releases/tag/3.1.1","reference_id":"","reference_type":"","scores":[{"value":"1.8","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA: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/2025-05-13T20:13:56Z/"}],"url":"https://github.com/pallets/flask/releases/tag/3.1.1"},{"reference_url":"https://github.com/pallets/flask/security/advisories/GHSA-4grg-w6v8-c28g","reference_id":"","reference_type":"","scores":[{"value":"LOW","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"1.8","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA: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/2025-05-13T20:13:56Z/"}],"url":"https://github.com/pallets/flask/security/advisories/GHSA-4grg-w6v8-c28g"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2025-47278","reference_id":"","reference_type":"","scores":[{"value":"1.8","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-47278"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1105794","reference_id":"1105794","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1105794"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2365965","reference_id":"2365965","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2365965"},{"reference_url":"https://github.com/advisories/GHSA-4grg-w6v8-c28g","reference_id":"GHSA-4grg-w6v8-c28g","reference_type":"","scores":[{"value":"LOW","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-4grg-w6v8-c28g"},{"reference_url":"https://usn.ubuntu.com/7534-1/","reference_id":"USN-7534-1","reference_type":"","scores":[],"url":"https://usn.ubuntu.com/7534-1/"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/71008?format=json","purl":"pkg:pypi/flask@3.1.1","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-rx8q-6dwq-a3hs"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/flask@3.1.1"}],"aliases":["CVE-2025-47278","GHSA-4grg-w6v8-c28g"],"risk_score":1.4,"exploitability":"0.5","weighted_severity":"2.7","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-ypj9-hez8-qbcs"}],"risk_score":"1.9","resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/flask@3.1.1"}