CVE-2026-25651: client-certificate-auth is middleware for Node.js implementing client SSL certificate authentication/authoriza

Q: How do I fix CVE-2026-25651?

client-certificate-auth: upgrade to 1.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-25651 being exploited?

CVE-2026-25651 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-25651 affect?

CVE-2026-25651 affects client-certificate-auth. Severity is medium (CVSS 6.1). 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 r

Q: How urgent is CVE-2026-25651?

Priority 28/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2026-25651 is a medium-severity flaw (CVSS 6.1) affecting client-certificate-auth. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-601
Published	2026-02-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: tgies

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-06 19:16 UTCPublished CVE record published
2026-06-17 10:25 UTCUpdated Record last modified

tgies client-certificate-auth UPGRADE

Affected: >= 0.2.1 and < 1.0.0

Fixed in: 1.0.0

Safe to downgrade to: a release before 0.2.1

1. Check installed version

npm ls client-certificate-auth

2. UPGRADE to 1.0.0

npm install client-certificate-auth@">=1.0.0"

3. If no update is available yet, DOWNGRADE to a release before 0.2.1

npm view client-certificate-auth versions npm install client-certificate-auth@"<0.2.1"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-25651?

client-certificate-auth: upgrade to 1.0.0. Exact commands for each OS are on this page.

Is CVE-2026-25651 being exploited?

CVE-2026-25651 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-25651 affect?

CVE-2026-25651 affects client-certificate-auth. Severity is medium (CVSS 6.1). 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 r

How urgent is CVE-2026-25651?

Priority 28/100. Public exploit reference

Software pages

Node.js vulnerabilities

References

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