{"cve":"CVE-2023-43804","nvd":{"published":"2023-10-04T17:15:10.163","modified":"2026-06-17T06:26:29.040","status":"Modified","description":"urllib3 is a user-friendly HTTP client library for Python. urllib3 doesn't treat the `Cookie` HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a `Cookie` header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly. This issue has been patched in urllib3 version 1.26.17 or 2.0.5.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-200"],"references":["https://github.com/urllib3/urllib3/commit/01220354d389cd05474713f8c982d05c9b17aafb","https://github.com/urllib3/urllib3/commit/644124ecd0b6e417c527191f866daa05a5a2056d","https://github.com/urllib3/urllib3/security/advisories/GHSA-v845-jxx5-vc9f","https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5F5CUBAN5XMEBVBZPHFITBLMJV5FIJJ5/"],"products":["debian:debian_linux","fedoraproject:fedora","python:urllib3"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2023-43804","score":0.0136,"percentile":0.7174,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-v845-jxx5-vc9f","url":"https://osv.dev/vulnerability/GHSA-v845-jxx5-vc9f","summary":"`Cookie` HTTP header isn't stripped on cross-origin redirects","modified":"2026-09-10T03:49:24.753610811Z","packages":[{"ecosystem":"PyPI","name":"urllib3","purl":"pkg:pypi/urllib3","ranges":[">=2.0.0 <2.0.6"],"fixed":["2.0.6"]},{"ecosystem":"PyPI","name":"urllib3","purl":"pkg:pypi/urllib3","ranges":["<1.26.17"],"fixed":["1.26.17"]}]},{"id":"PYSEC-2023-192","url":"https://osv.dev/vulnerability/PYSEC-2023-192","summary":"","modified":"2023-11-08T04:13:33.452167Z","packages":[{"ecosystem":"PyPI","name":"urllib3","purl":"pkg:pypi/urllib3","ranges":[">=2.0.0 <2.0.6","<1.26.17"],"fixed":["2.0.6","1.26.17"]}]}],"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."]}