{"cve":"CVE-2026-44431","nvd":{"published":"2026-05-13T16:16:57.150","modified":"2026-06-26T12:16:32.423","status":"Modified","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.","cvss_v4":{"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","score":8.2},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3},"cwes":["CWE-200"],"references":["https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvc","https://lists.debian.org/debian-lts-announce/2026/06/msg00040.html"],"products":["python:urllib3"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-44431","score":0.00331,"percentile":0.26333,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-qccp-gfcp-xxvc","url":"https://osv.dev/vulnerability/GHSA-qccp-gfcp-xxvc","summary":"urllib3: Sensitive headers forwarded across origins in proxied low-level redirects","modified":"2026-09-10T03:50:47.272765640Z","packages":[{"ecosystem":"PyPI","name":"urllib3","purl":"pkg:pypi/urllib3","ranges":[">=1.23 <2.7.0"],"fixed":["2.7.0"]}]},{"id":"PYSEC-2026-141","url":"https://osv.dev/vulnerability/PYSEC-2026-141","summary":"","modified":"2026-05-20T09:19:20.983812Z","packages":[{"ecosystem":"PyPI","name":"urllib3","purl":"pkg:pypi/urllib3","ranges":[">=1.23 <2.7.0"],"fixed":["2.7.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}