CVE-2026-93602
CVE-2026-93602
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.002 (9.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 9.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000
Weakness classification (CWE)
References
- github.com/rustls/webpki/security/advisories/GHSA-pwjx-qhcg-rvj4 (vendor-advisory)
- www.vulncheck.com/advisories/rustls-webpki-before-0.103.10-crl-revocation-check… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-93602?
- CVE-2026-93602 is a medium-severity vulnerability, classified under Improper Check for Certificate Revocation. CVSS score: 4.4/10. Published 2026-09-18.
- How severe is CVE-2026-93602?
- Medium severity. CVSS v3 base score is 4.4 out of 10.