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The pathLenConstraint check in the certificate chain validation was gated on the keyUsage extension being present. When a CA certificate omitted the keyUsage extension but included basicConstraints with a pathLenConstraint, the constraint was silently skipped, allowing chains that exceeded the maximum permitted depth. Remove the keyUsage guard so pathLenConstraint is enforced whenever basicConstraints is present.
davidlehn
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Oct 27, 2026
- [x509] Enforce `basicConstraints` `pathLenConstraint` in chain verification for CA certificates without a `keyUsage` extension. - Based on the fix in PR #1142 (eddieran). - Address GHSA-h46v-rmh6-fq4f: - GHSA-h46v-rmh6-fq4f - Add submitted PoC. - Add tests. Co-authored-by: ran <edding.suree@gmail.com>
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Thank you. The fix in node-forge 1.4.1 enforces |
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Summary
Fixes GHSA-h8mc-2r26-8398. This replaces #1141.
The
pathLenConstraintcheck inverifyCertificateChainwas gated on thekeyUsageextension being present (keyUsageExt !== null). When a CA certificate omitted thekeyUsageextension but includedbasicConstraintswith apathLenConstraint, the constraint was silently skipped — allowing certificate chains that exceeded the maximum permitted intermediate CA depth.Changes
In
lib/x509.js, the condition guarding thepathLenConstraintenforcement now checks forbcExt !== nullinstead ofkeyUsageExt !== null, so the constraint is enforced wheneverbasicConstraintsis present, regardless of whetherkeyUsageis also present.