{"id":"PYSEC-2026-3544","details":"Capstone is a disassembly framework. Versions prior to 6.0.0-Alpha8 and 5.0.8 have a NULL pointer dereference in `modRMRequired()` and `decode()` when disassembling 3DNow! opcodes (`0F 0F`) in builds compiled with `-DCAPSTONE_X86_REDUCE`, allowing a remote attacker to crash any application using the reduced X86 Capstone library by supplying a crafted input containing the 4-byte sequence `0F 0F \u003cmodrm\u003e \u003cimm8\u003e`. Versions 6.0.0-Alpha8 and 5.0.8 patch the issue.","aliases":["CVE-2026-47143","GHSA-289w-cm54-fgrm"],"modified":"2026-07-31T10:30:18.554773099Z","published":"2026-07-21T21:16:50.270Z","references":[{"type":"FIX","url":"https://github.com/capstone-engine/capstone/commit/a0201371719b5aaa91d318ab2898843718f92d1f"},{"type":"FIX","url":"https://github.com/capstone-engine/capstone/commit/fab595205fee206f5c21be6ed8ad2eaf9225f1c7"},{"type":"FIX","url":"https://github.com/capstone-engine/capstone/pull/2924"},{"type":"EVIDENCE","url":"https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm"}],"affected":[{"package":{"name":"capstone","ecosystem":"PyPI","purl":"pkg:pypi/capstone"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.0.8"}]}],"versions":["2.0","2.1","3.0","3.0.1","3.0.2","3.0.3","3.0.4","3.0.5","3.0.5.post1","3.0.5rc2","4.0.0","4.0.1","4.0.2","5.0.0","5.0.0.post1","5.0.0rc2","5.0.0rc4","5.0.1","5.0.2","5.0.3","5.0.4","5.0.5","5.0.6","5.0.7"],"ecosystem_specific":{},"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/capstone/PYSEC-2026-3544.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}