CVE-2026-47143
Capstone has a NULL Pointer Dereference with 3DNow! opcodes
CVSS Score
5.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-476 |
| Vendor | capstone-engine |
| Product | capstone |
| Published | Jul 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
capstone-engine / capstone
< 5.0.8 < 6.0.0-Alpha8
References
github.com: https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm github.com: https://github.com/capstone-engine/capstone/pull/2924 github.com: https://github.com/capstone-engine/capstone/commit/a0201371719b5aaa91d318ab2898843718f92d1f github.com: https://github.com/capstone-engine/capstone/commit/fab595205fee206f5c21be6ed8ad2eaf9225f1c7