CVE-2026-47143: Capstone-Engine Capstone

Medium severity, CVSS 5.9. EPSS: 0.5% chance of exploitation in the next 30 days.

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 <modrm> <imm8>`. Versions 6.0.0-Alpha8 and 5.0.8 patch the issue.

Affected products

• Capstone-Engine Capstone: before 5.0.8 (fixed in 5.0.8); version 6.0.0 only

Published 2026-07-21. Last modified 2026-07-30.