What is the CVSS score of CVE-2026-25651?

CVE-2026-25651 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Node.js are affected by CVE-2026-25651?

Organizations using client-certificate-auth should be aware of moderate risk from CVE-2026-25651 rated CVSS 6.1. Exploitation could compromise the security of affected deployments.. A patch is available.

Is there a public PoC exploit available for CVE-2026-25651?

Yes, a public proof-of-concept exploit is available for CVE-2026-25651. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-25651?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Node.js CVE-2026-25651

MEDIUM

URL Redirection to Untrusted Site (Open Redirect) (CWE-601)

2026-02-06 security-advisories@github.com

GHSA-m4w9-gch5-c2g4

Node.js TLS Open Redirect Client Certificate Auth

6.1

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.1 MEDIUM

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 24, 2026 - 21:00 vuln.today

Public exploit code

CVE Published

Feb 06, 2026 - 19:16 nvd

MEDIUM 6.1

DescriptionGitHub Advisory

client-certificate-auth is middleware for Node.js implementing client SSL certificate authentication/authorization. Versions 0.2.1 and 0.3.0 of client-certificate-auth contain an open redirect vulnerability. The middleware unconditionally redirects HTTP requests to HTTPS using the unvalidated Host header, allowing an attacker to redirect users to arbitrary domains. This vulnerability is fixed in 1.0.0.

AnalysisAI

Client-certificate-auth middleware for Node.js versions 0.2.1 and 0.3.0 fails to validate the Host header when redirecting HTTP requests to HTTPS, enabling attackers to craft malicious redirects that direct users to arbitrary domains. Public exploit code exists for this open redirect vulnerability, and no patch is currently available for affected versions.

Technical ContextAI

Classified as CWE-601 (URL Redirection to Untrusted Site (Open Redirect)). Affects Client-Certificate-Auth. client-certificate-auth is middleware for Node.js implementing client SSL certificate authentication/authorization. Versions 0.2.1 and 0.3.0 of client-certificate-auth contain an open redirect vulnerability. The middleware unconditionally redirects HTTP requests to HTTPS using the unvalidated Host header, allowing an attacker to redirect users to arbitrary domains. This vulnerability is fixed in 1.0.0.

RemediationAI

Fixed in version 1.0.0.. Restrict network access to the affected service where possible.

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CVE-2026-25651 vulnerability details – vuln.today

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