{"id":"CVE-2026-44431","state":"PUBLISHED","title":"urllib3: Sensitive headers forwarded across origins in proxied low-level redirects","description":"urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0.","publishedAt":"2026-05-13T15:20:24.588Z","updatedAt":"2026-06-26T11:01:19.373Z","severity":{"score":8.2,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["urllib3 urllib3"],"affected":[{"vendor":"urllib3","product":"urllib3","versions":[{"version":">= 1.23, < 2.7.0","status":"affected"}]}],"references":["https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvc","https://lists.debian.org/debian-lts-announce/2026/06/msg00040.html"],"weaknesses":["CWE-200"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/44xxx/CVE-2026-44431.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-44431","state":"PUBLISHED","datePublished":"2026-05-13T15:20:24.588Z","dateUpdated":"2026-06-26T11:01:19.373Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-06T14:40:00.954Z"},"containers":{"cna":{"title":"urllib3: Sensitive headers forwarded across origins in proxied low-level redirects","descriptions":[{"lang":"en","value":"urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0."}],"affected":[{"vendor":"urllib3","product":"urllib3","versions":[{"version":">= 1.23, < 2.7.0","status":"affected"}]}],"references":[{"url":"https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvc","name":"https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvc","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-200","lang":"en","description":"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-13T15:20:24.588Z"},"source":{"advisory":"GHSA-qccp-gfcp-xxvc","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-13T16:51:26.677054Z","id":"CVE-2026-44431","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-13T17:17:07.339Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2026/06/msg00040.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-06-26T11:01:19.373Z"}}]}}}