{"cve":"CVE-2018-25091","nvd":{"published":"2023-10-15T19:15:09.213","modified":"2026-06-17T01:54:41.900","status":"Modified","description":"urllib3 before 1.24.2 does not remove the authorization HTTP header when following a cross-origin redirect (i.e., a redirect that differs in host, port, or scheme). This can allow for credentials in the authorization header to be exposed to unintended hosts or transmitted in cleartext. NOTE: this issue exists because of an incomplete fix for CVE-2018-20060 (which was case-sensitive).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-601"],"references":["https://github.com/urllib3/urllib3/commit/adb358f8e06865406d1f05e581a16cbea2136fbc","https://github.com/urllib3/urllib3/compare/1.24.1...1.24.2","https://github.com/urllib3/urllib3/issues/1510","https://github.com/urllib3/urllib3/commit/adb358f8e06865406d1f05e581a16cbea2136fbc","https://github.com/urllib3/urllib3/compare/1.24.1...1.24.2"],"products":["python:urllib3"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2018-25091","score":0.00594,"percentile":0.48423,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-gwvm-45gx-3cf8","url":"https://osv.dev/vulnerability/GHSA-gwvm-45gx-3cf8","summary":"Authorization Header forwarded on redirect","modified":"2024-11-18T23:24:00.169548Z","packages":[{"ecosystem":"PyPI","name":"urllib3","purl":"pkg:pypi/urllib3","ranges":["<1.24.2"],"fixed":["1.24.2"]}]},{"id":"PYSEC-2023-207","url":"https://osv.dev/vulnerability/PYSEC-2023-207","summary":"","modified":"2026-06-10T17:02:48.915096311Z","packages":[{"ecosystem":"PyPI","name":"urllib3","purl":"pkg:pypi/urllib3","ranges":["<1.24.2"],"fixed":["1.24.2"]}]}],"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."]}