{"id":"CVE-2026-44431","aliases":["GHSA-qccp-gfcp-xxvc","PYSEC-2026-141"],"url":"https://o3.security/vulnerability/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.","published":"2026-05-13T15:20:24.588Z","modified":"2026-08-07T11:31:28.385763216Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"urllib3","fixedVersion":"2.7.0"}],"fix":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:31:28.385763216Z"}}