Medium 5.1Published Jul 21, 2026

CVE-2026-47143Capstone has a NULL Pointer Dereference with 3DNow! opcodes

Updated under an hour ago (Oct 27, 2026, 6:20 PM ET)

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Every CVE for capstone-engine capstone

Exploited in the last 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.

CVSS: 5.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

capstone-engine capstone capstone_engine:capstone (from the name)	before 5.0.8; before 6.0.0-Alpha8	CNA record
capstone-engine capstone capstone-engine:capstone	before 5.0.8; 6.0.0; 6.0.0; 6.0.0; 6.0.0; 6.0.0; 6.0.0; 6.0.0	NVD

References

References

https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm	x-refsource-confirm, exploit, vendor-advisory
https://github.com/capstone-engine/capstone/pull/2924	x-refsource-misc, issue-tracking, patch
https://github.com/capstone-engine/capstone/commit/a0201371719b5aaa91d318ab2898843718f92d1f	x-refsource-misc, patch
https://github.com/capstone-engine/capstone/commit/fab595205fee206f5c21be6ed8ad2eaf9225f1c7	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.