CVE-2026-47143CWE-476

Capstone has a NULL Pointer Dereference with 3DNow! opcodes

Medium · published July 21, 2026

CVSS v3.1
5.1
EPSS
0%
Percentile
39.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.1 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00468 · 39.5th percentile
Weakness
CWE-476 · NULL Pointer Dereference
Published
2026-07-21T20:10Z
EPSS history
Timeline
  • 21 JUL 20:10Z
    Capstone has a NULL Pointer Dereference with 3DNow! opcodes
    cvelistv5