{"id":"CVE-2026-47143","aliases":["PYSEC-2026-3544","GHSA-289w-cm54-fgrm"],"title":"Capstone is a disassembly framework. Versions prior to 6.0.0-Alpha8 and 5.0.8 have a NULL pointer dereference in `modRMRequired()` and `d…","summary":"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`…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"capstone","product":"capstone","ecosystem":"pip","affected":["capstone < 5.0.8"],"patched":["capstone 5.0.8"],"published":"2026-07-21","updated":"2026-07-31","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/PYSEC-2026-3544","references":[{"url":"https://github.com/capstone-engine/capstone/commit/a0201371719b5aaa91d318ab2898843718f92d1f"},{"url":"https://github.com/capstone-engine/capstone/commit/fab595205fee206f5c21be6ed8ad2eaf9225f1c7"},{"url":"https://github.com/capstone-engine/capstone/pull/2924"},{"url":"https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm"}],"tags":["osv","pip"],"epss":0.00398,"epssPercentile":0.33851,"ingestedAt":"2026-07-31T19:10:07.604Z","slug":"CVE-2026-47143","body":"## Overview\n\nCapstone 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 <modrm> <imm8>`. Versions 6.0.0-Alpha8 and 5.0.8 patch the issue.\n\n## Affected packages\n\n- `capstone < 5.0.8`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `capstone 5.0.8`","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}