{"cve":"CVE-2026-93601","nvd":{"published":"2026-09-18T14:19:11.707","modified":"2026-09-22T20:25:55.870","status":"Awaiting Analysis","description":"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.","cvss_v4":{"vector":"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","score":2.1},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","score":2.2},"cwes":["CWE-295"],"references":["https://github.com/rustls/webpki/security/advisories/GHSA-xgp8-3hg3-c2mh","https://www.vulncheck.com/advisories/rustls-webpki-0.101.0-before-0.103.12-name-constraint-bypass"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:55:23.253742848+00:00"},"epss":{"cve":"CVE-2026-93601","score":0.00203,"percentile":0.10301,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-xgp8-3hg3-c2mh","url":"https://osv.dev/vulnerability/GHSA-xgp8-3hg3-c2mh","summary":"webpki: Name constraints were accepted for certificates asserting a wildcard name","modified":"2026-09-19T03:55:49.146112754Z","packages":[{"ecosystem":"crates.io","name":"rustls-webpki","purl":"pkg:cargo/rustls-webpki","ranges":[">=0.101.0 <0.103.12"],"fixed":["0.103.12"]},{"ecosystem":"crates.io","name":"rustls-webpki","purl":"pkg:cargo/rustls-webpki","ranges":[">=0.104.0-alpha.1 <0.104.0-alpha.6"],"fixed":["0.104.0-alpha.6"]}]},{"id":"RUSTSEC-2026-0099","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0099","summary":"Name constraints were accepted for certificates asserting a wildcard name","modified":"2026-09-19T08:42:27Z","packages":[{"ecosystem":"crates.io","name":"rustls-webpki","purl":"pkg:cargo/rustls-webpki","ranges":[">=0.0.0-0 <0.103.12",">=0.104.0-alpha.1 <0.104.0-alpha.6"],"fixed":["0.103.12","0.104.0-alpha.6"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}