{"cve":"CVE-2026-55553","nvd":{"published":"2026-08-25T17:17:32.113","modified":"2026-09-09T21:07:31.353","status":"Deferred","description":"urllib is an HTTP client for Node.js that supports authentication, redirects, timeouts, and other request features. Prior to 4.9.1 and 2.44.1, urllib follows redirects through followRedirect but reuses caller-supplied options across origins. In src/HttpClient.ts, #requestInternal recursively calls this.#requestInternal(nextUrl.href, options, requestContext), causing options.headers and auth or digestAuth values to be reused when the redirect target has a different scheme, host, or port. Authorization, Cookie, Proxy-Authorization, x-api-key, x-auth-token, and x-access-token can therefore be sent to an attacker-controlled redirected origin, exposing credentials intended for the original origin and potentially allowing reuse against the original partner API or related services. No user interaction is required. This issue is fixed in versions 2.44.1 and 4.9.1.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-200","CWE-201","CWE-522"],"references":["https://github.com/node-modules/urllib/commit/7c86c465883ebd3dea5109c87d7bbe3b00960a16","https://github.com/node-modules/urllib/commit/811a8d56e64e540bf6a19bf8b3737692f05d5c46","https://github.com/node-modules/urllib/pull/812","https://github.com/node-modules/urllib/pull/813","https://github.com/node-modules/urllib/releases/tag/v2.44.1"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:17.453294893+00:00"},"epss":{"cve":"CVE-2026-55553","score":0.0066,"percentile":0.51606,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-hq3h-g68c-hp78","url":"https://osv.dev/vulnerability/GHSA-hq3h-g68c-hp78","summary":"urllib's cross-origin redirects preserve credential-bearing request headers, leading to potential credential leakage","modified":"2026-08-25T23:49:20.860574642Z","packages":[{"ecosystem":"npm","name":"urllib","purl":"pkg:npm/urllib","ranges":[">=3.0.0 <4.9.1"],"fixed":["4.9.1"]},{"ecosystem":"npm","name":"urllib","purl":"pkg:npm/urllib","ranges":["<2.44.1"],"fixed":["2.44.1"]}]}],"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."]}