{"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":"2026-08-04T11:31:21.112396286Z","published":"2026-08-03T02:55:02.485Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12852.json","cna_assigner":"bcorg","cwe_ids":["CWE-789"]},"references":[{"type":"WEB","url":"https://github.com/bcgit/bc-java/wiki/CVE-2026-12852"},{"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"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"1.73"},{"fixed":"1.85"}]}}],"versions":["r1rv84","r1rv81","r1rv83","r1rv82","r1rv80","r1rv78","r1rv77","r1rv76","r1rv75","r1rv74","r1rv73"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12852.json"}}],"schema_version":"1.8.0","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"}]}