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CVE-2026-47143

Severity CVSS v4.0:
Pending analysis
Type:
CWE-476 NULL Pointer Dereference
Publication date:
21/07/2026
Last modified:
30/07/2026

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 `. Versions 6.0.0-Alpha8 and 5.0.8 patch the issue.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.10 MEDIUM
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.10
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:capstone-engine:capstone:*:*:*:*:*:*:*:* 5.0.8 (excluding)
cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha3:*:*:*:*:*:*
cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha4:*:*:*:*:*:*
cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha5:*:*:*:*:*:*
cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha6:*:*:*:*:*:*
cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha7:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools