{"id":"CVE-2025-50182","aliases":["GHSA-48p4-8xcf-vxj5","PYSEC-2026-1997"],"url":"https://o3.security/vulnerability/CVE-2025-50182","summary":"urllib3 does not control redirects in browsers and Node.js","details":"urllib3 is a user-friendly HTTP client library for Python. Starting in version 2.2.0 and prior to 2.5.0, urllib3 does not control redirects in browsers and Node.js. urllib3 supports being used in a Pyodide runtime utilizing the JavaScript Fetch API or falling back on XMLHttpRequest. This means Python libraries can be used to make HTTP requests from a browser or Node.js. Additionally, urllib3 provides a mechanism to control redirects, but the retries and redirect parameters are ignored with Pyodide; the runtime itself determines redirect behavior. This issue has been patched in version 2.5.0.","published":"2025-06-19T01:42:44.921Z","modified":"2026-08-08T03:47:48.418735696Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"urllib3","fixedVersion":"2.5.0"}],"fix":{"url":"https://github.com/urllib3/urllib3/commit/7eb4a2aafe49a279c29b6d1f0ed0f42e9736194f","label":"urllib3/urllib3@7eb4a2a"},"references":[{"type":"WEB","url":"https://github.com/urllib3/urllib3/releases/tag/2.5.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/50xxx/CVE-2025-50182.json"},{"type":"ADVISORY","url":"https://github.com/urllib3/urllib3/security/advisories/GHSA-48p4-8xcf-vxj5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-50182"},{"type":"FIX","url":"https://github.com/urllib3/urllib3/commit/7eb4a2aafe49a279c29b6d1f0ed0f42e9736194f"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-08T03:47:48.418735696Z"}}