CVE-2026-47143 Capstone-Engine — Exploit & Vulnerability Details MEDIUM

Parameter	Value
CVSS	5.9 (MEDIUM)
Affected Versions	before 5.0.8
Fixed In	5.0.8
Type	CWE-476 (NULL Pointer Dereference)
Vendor	Capstone-Engine
Public PoC	No

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.

Attack Parameters

Attack Vector

Network

Can be exploited remotely

Attack Complexity

High

Difficult to exploit

Privileges Required

None

No privileges needed

User Interaction

None

No user interaction needed

Impact Assessment

Confidentiality

None

No data leak

Integrity

None

No data modification

Availability

High

Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

CWE-476 NULL Pointer Dereference

Vulnerable Products 8

Configuration	From (including)	Up to (excluding)
Capstone-Engine Capstone cpe:2.3:a:capstone-engine:capstone::::::::	—	`5.0.8`
Capstone-Engine Capstone cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha1::::::	—	—
Capstone-Engine Capstone cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha2::::::	—	—
Capstone-Engine Capstone cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha3::::::	—	—
Capstone-Engine Capstone cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha4::::::	—	—
Capstone-Engine Capstone cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha5::::::	—	—
Capstone-Engine Capstone cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha6::::::	—	—
Capstone-Engine Capstone cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha7::::::	—	—