{"id":"CVE-2026-59644","summary":"MLS hash-ratchet honours arbitrary 32-bit generation counter from sender","details":"In Bouncy Castle for Java before 1.85, MLS hash-ratchet honours arbitrary 32-bit generation counter from sender.","modified":"2026-10-26T19:01:43.888679436Z","published":"2026-08-03T00:50:50.154Z","related":["SUSE-SU-2026:23127-1","SUSE-SU-2026:23150-1","SUSE-SU-2026:3559-1","openSUSE-SU-2026:11445-1","openSUSE-SU-2026:21538-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59644.json","cna_assigner":"bcorg","cwe_ids":["CWE-834"]},"references":[{"type":"WEB","url":"https://www.bouncycastle.org/download/bouncy-castle-java/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59644.json"},{"type":"ADVISORY","url":"https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059644"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59644"},{"type":"FIX","url":"https://github.com/bcgit/bc-java/commit/610d8757d855afe197df0de6d831cb75c81e3b9f"},{"type":"PACKAGE","url":"https://github.com/bcgit/bc-java"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bcgit/bc-java","events":[{"introduced":"9032821b326fba9fec7528899dfffa79f9f19aef"},{"fixed":"57fbd3c501f7a369f64eda311d6a709fc0bcae84"},{"fixed":"610d8757d855afe197df0de6d831cb75c81e3b9f"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"1.73"},{"fixed":"1.85"}]},{"range":[{"fixed":"610d8757d855afe197df0de6d831cb75c81e3b9f"}],"source":"REFERENCES_COMMIT"}]}}],"versions":["r1rv84","r1rv81","r1rv83","r1rv82","r1rv80","r1rv78","r1rv77","r1rv76","r1rv75","r1rv74","r1rv73"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-59644.json","vanir_signatures":[{"signature_version":"v1","source":"https://github.com/bcgit/bc-java/commit/610d8757d855afe197df0de6d831cb75c81e3b9f","target":{"file":"mls/src/main/java/org/bouncycastle/mls/GroupKeySet.java","function":"get"},"deprecated":false,"digest":{"function_hash":"306942460679204642382373326531311294129","length":311},"id":"CVE-2026-59644-05a1407c","signature_type":"Function"},{"target":{"file":"mls/src/main/java/org/bouncycastle/mls/GroupKeySet.java"},"deprecated":false,"digest":{"line_hashes":["220645778715355918153190826735545806309","57035913858609383723540021973489488035","125027476401058781299699804022824585491","96228978241383318008601718473293496267","25324854368272920711548822019957271420","130007600670974637961851151098111701141","102901367100248365111009937930070008712"],"threshold":0.9},"id":"CVE-2026-59644-8cbde9cd","signature_type":"Line","signature_version":"v1","source":"https://github.com/bcgit/bc-java/commit/610d8757d855afe197df0de6d831cb75c81e3b9f"}],"vanir_signatures_modified":"2026-10-26T19:01:43Z"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"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"}]}