{"id":"CVE-2026-59646","state":"PUBLISHED","title":"DTLS handshake reassembler allocates buffer from unchecked 24-bit length","description":"In Bouncy Castle for Java before 1.85, DTLS handshake reassembler allocates buffer from unchecked 24-bit length. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series).","publishedAt":"2026-08-03T00:48:29.386Z","updatedAt":"2026-08-03T14:53:11.064Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Amber","source":"bcorg"},"assigner":"bcorg","products":["Legion of the Bouncy Castle Inc. BC-JAVA","Legion of the Bouncy Castle Inc. BC-LTS-JAVA","Legion of the Bouncy Castle Inc. BC-FJA"],"affected":[{"vendor":"Legion of the Bouncy Castle Inc.","product":"BC-JAVA","packageName":"bctls","packageURL":"pkg:maven/org.bouncycastle/bctls-jdk18on","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.85","versionType":"maven"}],"platforms":["all"],"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java/","repo":"https://github.com/bcgit/bc-java","modules":["tls"],"programFiles":["DTLSReliableHandshake"]},{"vendor":"Legion of the Bouncy Castle Inc.","product":"BC-LTS-JAVA","packageName":"bctls-lts8on","packageURL":"pkg:maven/org.bouncycastle/bctls-lts8on","defaultStatus":"unaffected","versions":[{"version":"2.73.0","status":"affected","lessThan":"2.73.12","versionType":"maven"}],"platforms":["all"],"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java-lts/","repo":"https://github.com/bcgit/bc-lts-java","modules":["tls"],"programFiles":["DTLSReliableHandshake"]},{"vendor":"Legion of the Bouncy Castle Inc.","product":"BC-FJA","packageName":"bctls-fips","packageURL":"pkg:maven/org.bouncycastle/bctls-fips","defaultStatus":"unaffected","versions":[{"version":"1.0.0","status":"affected","lessThan":"1.0.24","versionType":"maven"},{"version":"2.0.0","status":"affected","lessThan":"2.0.24","versionType":"maven"},{"version":"2.1.0","status":"affected","lessThan":"2.1.24","versionType":"maven"}],"platforms":["all"],"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java-fips/"}],"references":["https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059646","https://github.com/bcgit/bc-java/commit/2ea38942c7917f6d7ab4de93d8a5336d021df0d9","https://github.com/bcgit/bc-java/commit/2d98721e71bbd822ffa0f84e088eea645cf679fa"],"weaknesses":["CWE-789"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/59xxx/CVE-2026-59646.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-59646","state":"PUBLISHED","datePublished":"2026-08-03T00:48:29.386Z","dateUpdated":"2026-08-03T14:53:11.064Z","assignerShortName":"bcorg","assignerOrgId":"91579145-5d7b-4cc5-b925-a0262ff19630","dateReserved":"2026-07-06T06:58:29.263Z"},"containers":{"cna":{"title":"DTLS handshake reassembler allocates buffer from unchecked 24-bit length","descriptions":[{"lang":"en","value":"In Bouncy Castle for Java before 1.85, DTLS handshake reassembler allocates buffer from unchecked 24-bit length. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series)."}],"affected":[{"vendor":"Legion of the Bouncy Castle Inc.","product":"BC-JAVA","packageName":"bctls","packageURL":"pkg:maven/org.bouncycastle/bctls-jdk18on","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.85","versionType":"maven"}],"platforms":["all"],"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java/","repo":"https://github.com/bcgit/bc-java","modules":["tls"],"programFiles":["DTLSReliableHandshake"]},{"vendor":"Legion of the Bouncy Castle Inc.","product":"BC-LTS-JAVA","packageName":"bctls-lts8on","packageURL":"pkg:maven/org.bouncycastle/bctls-lts8on","defaultStatus":"unaffected","versions":[{"version":"2.73.0","status":"affected","lessThan":"2.73.12","versionType":"maven"}],"platforms":["all"],"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java-lts/","repo":"https://github.com/bcgit/bc-lts-java","modules":["tls"],"programFiles":["DTLSReliableHandshake"]},{"vendor":"Legion of the Bouncy Castle Inc.","product":"BC-FJA","packageName":"bctls-fips","packageURL":"pkg:maven/org.bouncycastle/bctls-fips","defaultStatus":"unaffected","versions":[{"version":"1.0.0","status":"affected","lessThan":"1.0.24","versionType":"maven"},{"version":"2.0.0","status":"affected","lessThan":"2.0.24","versionType":"maven"},{"version":"2.1.0","status":"affected","lessThan":"2.1.24","versionType":"maven"}],"platforms":["all"],"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java-fips/"}],"references":[{"url":"https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059646","tags":["vendor-advisory"]},{"url":"https://github.com/bcgit/bc-java/commit/2ea38942c7917f6d7ab4de93d8a5336d021df0d9","tags":["patch"]},{"url":"https://github.com/bcgit/bc-java/commit/2d98721e71bbd822ffa0f84e088eea645cf679fa","tags":["patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","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":"HIGH","baseScore":8.7,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Amber"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-789","lang":"en","description":"CWE-789 Memory Allocation with Excessive Size Value","type":"CWE"}]}],"providerMetadata":{"shortName":"bcorg","orgId":"91579145-5d7b-4cc5-b925-a0262ff19630","dateUpdated":"2026-08-03T04:59:50.231Z"},"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":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-03T14:52:56.642144Z","id":"CVE-2026-59646","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-03T14:53:11.064Z"}}]}}}