{"id":"UBUNTU-CVE-2026-93602","details":"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.","modified":"2026-09-23T23:40:09Z","published":"2026-09-18T14:19:00Z","upstream":["CVE-2026-93602"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-93602"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-93602"},{"type":"REPORT","url":"https://github.com/rustls/webpki/security/advisories/GHSA-pwjx-qhcg-rvj4"},{"type":"REPORT","url":"https://rustsec.org/advisories/RUSTSEC-2026-0049.html"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/rustls-webpki-before-0.103.10-crl-revocation-check-bypass"}],"affected":[{"package":{"name":"rust-rustls-webpki","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/rust-rustls-webpki?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.101.4-4","0.101.7-2.1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-rustls-webpki-dev","binary_version":"0.101.7-2.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93602.json"}},{"package":{"name":"rust-rustls-webpki","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/rust-rustls-webpki?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.102.8-5","0.103.7-1","0.103.7-1build1","0.103.9+ds-1","0.103.9+ds-2"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-rustls-webpki-dev","binary_version":"0.103.9+ds-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93602.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}