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Vulnerability · Published Aug 25, 2026 · Assigned by GitHub_M

CVE-2026-55553urllib: Cross-origin redirects preserve credential-bearing request headers, leading to potential credential leakage

High 7.5

In plain English

A high-severity information exposure in urllib from node-modules. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 48.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmurllib4.9.1GHSA-hq3h-g68c-hp78
npmurllib2.44.1GHSA-hq3h-g68c-hp78

Affected products (as reported)

VendorProductVersions
node-modules urllib >= 3.0.0, < 4.9.1< 2.44.1

Weakness: CWE-200, CWE-201, CWE-522 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References