{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-8763","assignerOrgId":"91579145-5d7b-4cc5-b925-a0262ff19630","state":"PUBLISHED","assignerShortName":"bcorg","dateReserved":"2026-05-17T06:03:57.082Z","datePublished":"2026-08-03T00:36:05.088Z","dateUpdated":"2026-08-03T13:29:24.563Z"},"containers":{"cna":{"providerMetadata":{"orgId":"91579145-5d7b-4cc5-b925-a0262ff19630","shortName":"bcorg","dateUpdated":"2026-08-03T08:09:13.960Z"},"title":"Name Constraints bypass via trailing dot in rfc822Name and URI","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-295","description":"CWE-295 Improper Certificate Validation","type":"CWE"}]}],"affected":[{"vendor":"Legion of the Bouncy Castle Inc.","product":"BC-JAVA","platforms":["all"],"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java/","packageName":"bcprov","repo":"https://github.com/bcgit/bc-java","packageURL":"pkg:maven/org.bouncycastle/bcprov-jdk18on","modules":["core"],"programFiles":["PKIXNameConstraintValidator"],"versions":[{"status":"affected","version":"0","lessThan":"1.85","versionType":"maven"}],"defaultStatus":"unaffected"},{"vendor":"Legion of the Bouncy Castle Inc.","product":"BC-LTS-JAVA","platforms":["all"],"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java-lts/","packageName":"bcprov-lts8on","repo":"https://github.com/bcgit/bc-lts-java","packageURL":"pkg:maven/org.bouncycastle/bcprov-lts8on","modules":["core"],"programFiles":["PKIXNameConstraintValidator"],"versions":[{"status":"affected","version":"2.73.0","lessThan":"2.73.12","versionType":"maven"}],"defaultStatus":"unaffected"},{"vendor":"Legion of the Bouncy Castle Inc.","product":"BC-FJA","platforms":["all"],"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java-fips/","packageName":"bc-fips","packageURL":"pkg:maven/org.bouncycastle/bc-fips","versions":[{"status":"affected","version":"1.0.0","lessThan":"1.0.2.7","versionType":"maven"},{"status":"affected","version":"2.0.0","lessThan":"2.0.2","versionType":"maven"},{"status":"affected","version":"2.1.0","lessThan":"2.1.3","versionType":"maven"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"In Bouncy Castle for Java before 1.85, Name Constraints bypass via trailing dot in rfc822Name and URI. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>In Bouncy Castle for Java before 1.85, Name Constraints bypass via trailing dot in rfc822Name and URI. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).</p>"}]}],"references":[{"url":"https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908763","tags":["vendor-advisory"]},{"url":"https://github.com/bcgit/bc-java/commit/2c28b253a44681fbbc562561eab6ad383d2ae558","tags":["patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"AMBER","version":"4.0","baseSeverity":"CRITICAL","baseScore":9.3,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber"}}],"credits":[{"lang":"en","value":"Alex Gaynor in collaboration with Claude and Anthropic Research","type":"reporter"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"bc release-notes template"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-03T13:29:15.549114Z","id":"CVE-2026-8763","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-03T13:29:24.563Z"}}]}}