{"id":"CVE-2026-44431","summary":"urllib3: Sensitive headers forwarded across origins in proxied low-level redirects","details":"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.","aliases":["GHSA-qccp-gfcp-xxvc","PYSEC-2026-141"],"modified":"2026-07-15T01:49:02.178010510Z","published":"2026-05-13T15:20:24.588Z","related":["ALSA-2026:27929","ALSA-2026:28000","ALSA-2026:28157","ALSA-2026:28158","ALSA-2026:28159","ALSA-2026:32992","ALSA-2026:36732","CGA-c7jq-4mq6-p587","SUSE-SU-2026:2065-1","SUSE-SU-2026:2067-1","SUSE-SU-2026:2119-1","SUSE-SU-2026:21728-1","SUSE-SU-2026:21741-1","SUSE-SU-2026:21955-1","SUSE-SU-2026:22003-1","SUSE-SU-2026:22011-1","SUSE-SU-2026:2486-1","openSUSE-SU-2026:10838-1","openSUSE-SU-2026:20861-1","openSUSE-SU-2026:20871-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44431.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-200"]},"references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2026/06/msg00040.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44431.json"},{"type":"ADVISORY","url":"https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44431"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/urllib3/urllib3","events":[{"introduced":"7c216f433e39e184b84cbfa49e41135a89e4baa0"},{"fixed":"9a950b92d999f906b6020bb2d1076ee56cddd5d2"}],"database_specific":{"cpe":"cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"1.23"},{"fixed":"2.7.0"}],"source":["AFFECTED_FIELD","CPE_RANGE"]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44431.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"}]}