CVE-2026-47143
MEDIUMCapstone has a NULL Pointer Dereference with 3DNow! opcodes
Title source: cnaDescription
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.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm
X_Refsource_Misc x_refsource_misc
https://github.com/capstone-engine/capstone/pull/2924
X_Refsource_Misc x_refsource_misc
https://github.com/capstone-engine/capstone/commit/a0201371719b5aaa91d318ab2898843718f92d1f
X_Refsource_Misc x_refsource_misc
https://github.com/capstone-engine/capstone/commit/fab595205fee206f5c21be6ed8ad2eaf9225f1c7
Scores
CVSS v3
5.1
EPSS
0.0018
EPSS Percentile
7.5%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-476
Status
published
Products (3)
capstone-engine/capstone
6.0.0 alpha1 (7 CPE variants)
capstone-engine/capstone
< 5.0.8 (2 CPE variants)
capstone-engine/capstone
< 6.0.0-Alpha8
Published
Jul 21, 2026
Tracked Since
Jul 22, 2026