{"id":"CVE-2026-93601","state":"PUBLISHED","title":"rustls webpki 0.101.0 before 0.103.12 Name Constraint Bypass","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.","publishedAt":"2026-09-18T13:20:11.571Z","updatedAt":"2026-09-18T17:49:52.199Z","severity":{"score":2.1,"label":"Low","version":"4.0","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","source":"VulnCheck"},"assigner":"VulnCheck","products":["rustls webpki"],"affected":[{"vendor":"rustls","product":"webpki","packageURL":"pkg:cargo/rustls-webpki","defaultStatus":"unaffected","versions":[{"version":"0.101.0","status":"affected","lessThan":"0.103.12","versionType":"semver"},{"version":"0.104.0-alpha.1","status":"affected","lessThan":"0.104.0-alpha.6","versionType":"semver"}]}],"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"],"weaknesses":["CWE-295"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93601.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93601","state":"PUBLISHED","datePublished":"2026-09-18T13:20:11.571Z","dateUpdated":"2026-09-18T17:49:52.199Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-09-18T11:00:32.756Z"},"containers":{"cna":{"title":"rustls webpki 0.101.0 before 0.103.12 Name Constraint Bypass","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"rustls","product":"webpki","packageURL":"pkg:cargo/rustls-webpki","defaultStatus":"unaffected","versions":[{"version":"0.101.0","status":"affected","lessThan":"0.103.12","versionType":"semver"},{"version":"0.104.0-alpha.1","status":"affected","lessThan":"0.104.0-alpha.6","versionType":"semver"}]}],"references":[{"url":"https://github.com/rustls/webpki/security/advisories/GHSA-xgp8-3hg3-c2mh","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-xgp8-3hg3-c2mh)"},{"url":"https://www.vulncheck.com/advisories/rustls-webpki-0.101.0-before-0.103.12-name-constraint-bypass","name":"VulnCheck Advisory: rustls webpki 0.101.0 before 0.103.12 Name Constraint Bypass","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":2.1,"baseSeverity":"LOW"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":2.2,"baseSeverity":"LOW"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-295","lang":"en","description":"Improper Certificate Validation","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-18T13:20:11.571Z"},"datePublic":"2026-04-15T00:00:00.000Z","credits":[{"lang":"en","value":"1seal","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-18T17:49:32.542670Z","id":"CVE-2026-93601","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-18T17:49:52.199Z"}}]}}}