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Vulnerability record · CVE-2026-47143 · published 21 July 2026

CVE-2026-47143: Capstone-engine capstone null pointer dereference vulnerability

Capstone Engine · Capstone

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.

5.9 CVSS 3.1 Medium EPSS 0.47% · top 62.0% CWE-476 · NULL pointer dereference
5.9CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
30 Jul 2026Last modified by NVD

Description

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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/capstone-engine/capstone/commit/a0201371719b5aaa91d318ab2898843718f92d1f Patch
https://github.com/capstone-engine/capstone/commit/fab595205fee206f5c21be6ed8ad2eaf9225f1c7 Patch
https://github.com/capstone-engine/capstone/pull/2924 Issue TrackingPatch
https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm ExploitVendor Advisory
https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-47143), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.