What’s Vulnerable › Vulnerabilities

CVE-2026-93602: rustls-webpki before 0.103.10 CRL Revocation Check Bypass

• Severity: medium (CVSS 4.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-18 · updated 2026-09-22
• Weakness: CWE-299

Description

rustls-webpki versions before 0.103.10 and 0.104.0-alpha.5 contain faulty CRL authority-matching logic that compares only the first distributionPoint against each CRL's IssuingDistributionPoint, ignoring additional distributionPoints. Attackers with a compromised trusted issuing authority can present revoked certificates that pass revocation checks under UnknownStatusPolicy::Allow, or cause incorrect errors under the default deny policy.

Affected products

• rustls webpki: from 0.102.0-alpha.0 before 0.103.10; from 0.104.0-alpha.1 before 0.104.0-alpha.5 — fixed in 0.103.10, 0.104.0-alpha.5

How to fix

Upgrade to a fixed version: rustls webpki 0.103.10, 0.104.0-alpha.5. Check the vendor advisory for mitigations.

References

• https://github.com/rustls/webpki/security/advisories/GHSA-pwjx-qhcg-rvj4
• https://www.vulncheck.com/advisories/rustls-webpki-before-0.103.10-crl-revocation-check-bypass

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