CVE-2026-125336 Forge: X.509 nameConstraints not enforced by verifyCertificateChain()
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-125336?
CVE-2026-125336 is a high-severity vulnerability in digitalbazaar forge, published on 10 Nov 2026.
Official description
Forge (also called node-forge) is a native implementation of Transport Layer Security in JavaScript. Prior to 1.4.3, pki.verifyCertificateChain() in lib/x509.js does not decode or enforce the X.509 nameConstraints extension while validating certificate paths. A name-constrained certificate authority with a non-critical extension can therefore issue a leaf certificate with a subjectAltName dNSName or subject commonName outside a permitted subtree or inside an excluded subtree, and node-forge accepts the chain. Exploitation requires a name-constrained CA that chains to a trusted root and either its private key or the ability to obtain an out-of-scope certificate, allowing impersonation of names outside the delegated namespace, including against forge.tls clients. Chains without nameConstraints are not affected, and affected versions safely reject critical nameConstraints as unsupported rather than accepting them. This issue is fixed in version 1.4.3.
Weakness: CWE-295
Which versions are affected by CVE-2026-125336?
How do I fix CVE-2026-125336?
No fix has been published for CVE-2026-125336 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-125336 being exploited?
There is no known exploitation of CVE-2026-125336 in the wild and no public exploit code.
Sources
Also known as GHSA-3cc4-3294-vgjf, UBUNTU-CVE-2026-125336.