{"id":"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 \u003e= 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.","aliases":["GHSA-xgp8-3hg3-c2mh","RUSTSEC-2026-0099"],"modified":"2026-09-19T03:55:49.146112754Z","published":"2026-09-18T13:20:11.571Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93601.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-295"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rustls/webpki","events":[{"introduced":"05e736fd927e3b0c28bb5b24b2bed684b32e1485"},{"fixed":"27131d476e2b68a537e629d6d012bef8dad6efd3"},{"introduced":"5a23b7e1c7b6e898d6bb437730a029b2695aa3eb"},{"fixed":"2c2d56b2090127d555d6d9b910d2a9e288259e54"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0.101.0"},{"fixed":"0.103.12"},{"introduced":"0.104.0-alpha.1"},{"fixed":"0.104.0-alpha.6"}]}}],"versions":["v/0.104.0-alpha.5","v/0.104.0-alpha.4","v/0.104.0-alpha.3","v/0.104.0-alpha.2","v/0.104.0-alpha.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93601.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}]}