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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55553
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-25 17:17:32 UTC
Updated2026-08-25 19:16:49 UTC
Descriptionurllib 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-200 | CWE-201 | CWE-522 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-201 CWE-201: Insertion of Sensitive Information Into Sent Data | CWE-522 CWE-522: Insufficiently Protected Credentials

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Node-modules Urllib affected >= 3.0.0, < 4.9.1 Not specified
CNA Node-modules Urllib affected < 2.44.1 Not specified

References

ReferenceSourceLinkTags
github.com/node-modules/urllib/pull/812 [email protected] github.com
github.com/node-modules/urllib/commit/811a8d56e64e540bf6a19bf8b3737692f0... [email protected] github.com
github.com/node-modules/urllib/releases/tag/v4.9.1 [email protected] github.com
github.com/node-modules/urllib/pull/813 [email protected] github.com
github.com/node-modules/urllib/security/advisories/GHSA-hq3h-g68c-hp78 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/node-modules/urllib/releases/tag/v2.44.1 [email protected] github.com
github.com/node-modules/urllib/commit/7c86c465883ebd3dea5109c87d7bbe3b00... [email protected] github.com
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