{"id":"CVE-2026-93600","state":"PUBLISHED","title":"rustls webpki Name Constraints URI Validation Bypass","description":"rustls-webpki (rustls/webpki) versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issued certificates, the flaw is only reachable after successful signature verification and requires a misissued certificate to exploit; the library also provides no API for asserting URI names, and URI name constraints are otherwise unimplemented. Versions 0.103.12 and 0.104.0-alpha.6 reject URI name constraints unconditionally.","publishedAt":"2026-09-18T13:20:10.899Z","updatedAt":"2026-09-21T20:51:59.078Z","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-965h-392x-2mh5","https://www.vulncheck.com/advisories/rustls-webpki-name-constraints-uri-validation-bypass"],"weaknesses":["CWE-295"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93600.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93600","state":"PUBLISHED","datePublished":"2026-09-18T13:20:10.899Z","dateUpdated":"2026-09-21T20:51:59.078Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-09-18T11:00:32.756Z"},"containers":{"cna":{"title":"rustls webpki Name Constraints URI Validation Bypass","descriptions":[{"lang":"en","value":"rustls-webpki (rustls/webpki) versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issued certificates, the flaw is only reachable after successful signature verification and requires a misissued certificate to exploit; the library also provides no API for asserting URI names, and URI name constraints are otherwise unimplemented. Versions 0.103.12 and 0.104.0-alpha.6 reject URI name constraints unconditionally."}],"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-965h-392x-2mh5","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-965h-392x-2mh5)"},{"url":"https://www.vulncheck.com/advisories/rustls-webpki-name-constraints-uri-validation-bypass","name":"VulnCheck Advisory: rustls webpki Name Constraints URI Validation 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":"2026-09-18T13:20:10.899Z"},"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":"2026-09-21T16:22:50.273345Z","id":"CVE-2026-93600","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":"2026-09-21T20:51:59.078Z"}}]}}}