CVE-2026-55553

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.

• CWE-200
• CWE-201
• CWE-522

• 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
• https://github.com/node-modules/urllib/releases/tag/v4.9.1
• https://github.com/node-modules/urllib/security/advisories/GHSA-hq3h-g68c-hp78
• https://github.com/node-modules/urllib/security/advisories/GHSA-hq3h-g68c-hp78

Published

Aug 25, 2026

Last Modified

Sep 9, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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