{"id":"CVE-2026-12852","summary":"MLS wire decoder allocates attacker-declared opaque length before bounds check","details":"In Bouncy Castle for Java before 1.85, MLS wire decoder allocates attacker-declared opaque length before bounds check.","modified":"2026-10-25T07:13:38.776869520Z","published":"2026-08-03T02:55:02.485Z","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":{"cna_assigner":"bcorg","cwe_ids":["CWE-789"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12852.json"},"references":[{"type":"WEB","url":"https://www.bouncycastle.org/download/bouncy-castle-java/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12852.json"},{"type":"ADVISORY","url":"https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012852"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12852"},{"type":"FIX","url":"https://github.com/bcgit/bc-java/commit/a747038bb5bbd5e29fb2b7607ab38af1fd8d1790"},{"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":"a747038bb5bbd5e29fb2b7607ab38af1fd8d1790"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"1.73"},{"fixed":"1.85"}]},{"range":[{"fixed":"a747038bb5bbd5e29fb2b7607ab38af1fd8d1790"}],"source":"REFERENCES_COMMIT"}]}}],"versions":["r1rv84","r1rv81","r1rv83","r1rv82","r1rv80","r1rv78","r1rv77","r1rv76","r1rv75","r1rv74","r1rv73"],"database_specific":{"vanir_signatures":[{"deprecated":false,"digest":{"length":266,"function_hash":"92295335491211025736448040308708710108"},"id":"CVE-2026-12852-8ef8f8a8","signature_type":"Function","signature_version":"v1","source":"https://github.com/bcgit/bc-java/commit/a747038bb5bbd5e29fb2b7607ab38af1fd8d1790","target":{"file":"mls/src/main/java/org/bouncycastle/mls/codec/MLSInputStream.java","function":"readAll"}},{"signature_version":"v1","source":"https://github.com/bcgit/bc-java/commit/a747038bb5bbd5e29fb2b7607ab38af1fd8d1790","target":{"file":"mls/src/main/java/org/bouncycastle/mls/codec/MLSInputStream.java"},"deprecated":false,"digest":{"line_hashes":["165593616814765860092658684244893193843","235063781483236034420533035909420169182","338363851271881968021307034365317425750","57069292492115989365116917505383793201"],"threshold":0.9},"id":"CVE-2026-12852-94684acf","signature_type":"Line"},{"signature_type":"Function","signature_version":"v1","source":"https://github.com/bcgit/bc-java/commit/a747038bb5bbd5e29fb2b7607ab38af1fd8d1790","target":{"function":"suite","file":"mls/src/test/java/org/bouncycastle/mls/test/AllTests.java"},"deprecated":false,"digest":{"function_hash":"235437277780272800208970287964717024610","length":192},"id":"CVE-2026-12852-96102330"},{"id":"CVE-2026-12852-a25814bb","signature_type":"Line","signature_version":"v1","source":"https://github.com/bcgit/bc-java/commit/a747038bb5bbd5e29fb2b7607ab38af1fd8d1790","target":{"file":"mls/src/test/java/org/bouncycastle/mls/test/AllTests.java"},"deprecated":false,"digest":{"line_hashes":["218902235986088413190436015791436355394","142954904135386976371266999333847028157","25430774948821357363219746391799485253","296670093081609531050956418526677471737"],"threshold":0.9}}],"vanir_signatures_modified":"2026-10-25T07:13:38Z","source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-12852.json"}}],"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"}]}