GHSA-pwjx-qhcg-rvj4

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GHSA-pwjx-qhcg-rvj4

Summary: webpki: CRLs not considered authoritative by Distribution Point due to faulty matching logic

Details: If a certificate had more than one `distributionPoint`, then only the first `distributionPoint` would be considered against each CRL's `IssuingDistributionPoint` `distributionPoint`, and then the certificate's subsequent `distributionPoint`s would be ignored. The impact was that correct provided CRLs would not be consulted to check revocation. With `UnknownStatusPolicy::Deny` (the default) this would lead to incorrect but safe `Error::UnknownRevocationStatus`. With `UnknownStatusPolicy::Allow` this would lead to inappropriate acceptance of revoked certificates. This vulnerability is thought to be of limited impact. This is because both the certificate and CRL are signed -- an attacker would need to compromise a trusted issuing authority to trigger this bug. An attacker with such capabilities could likely bypass revocation checking through other more impactful means (such as publishing a valid, empty CRL.) More likely, this bug would be latent in normal use, and an attacker could leverage faulty revocation checking to continue using a revoked credential.

References: https://github.com/rustls/webpki/security/advisories/GHSA-pwjx-qhcg-rvj4, https://github.com/rustls/webpki, https://rustsec.org/advisories/RUSTSEC-2026-0049.html