{"id":"CVE-2026-93601","aliases":["GHSA-xgp8-3hg3-c2mh","RUSTSEC-2026-0099"],"url":"https://o3.security/vulnerability/CVE-2026-93601","summary":"rustls webpki 0.101.0 before 0.103.12 Name Constraint Bypass","details":"rustls-webpki (the Rust webpki fork used by rustls) versions >= 0.101.0 and prior to 0.103.12 and 0.104.0-alpha.6 incorrectly accepted permitted-subtree DNS name constraints for certificates asserting a wildcard name. For example, a name constraint of accept.example.com was treated as satisfied by a certificate for *.example.com, which could feasibly assert reject.example.com — a name outside the permitted subtree. Because name constraints are restrictions applied to otherwise properly issued certificates, the issue is only reachable after signature verification succeeds and requires a misissued wildcard certificate to exploit.","published":"2026-09-18T13:20:11.571Z","modified":"2026-11-04T17:27:17.420758592Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"crates.io","name":"rustls-webpki","fixedVersion":"0.103.12"},{"ecosystem":"crates.io","name":"rustls-webpki","fixedVersion":"0.104.0-alpha.6"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93601.json"},{"type":"ADVISORY","url":"https://github.com/rustls/webpki/security/advisories/GHSA-xgp8-3hg3-c2mh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93601"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/rustls-webpki-0.101.0-before-0.103.12-name-constraint-bypass"},{"type":"PACKAGE","url":"https://github.com/rustls/webpki"},{"type":"WEB","url":"https://rustsec.org/advisories/RUSTSEC-2026-0099.html"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-11-04T17:27:17.420758592Z"}}