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Vulnerability · Published Jul 21, 2026 · Assigned by GitHub_M

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

Medium 5.1

In plain English

A medium-severity null pointer dereference in capstone from capstone-engine. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.1Medium
Exploit odds (30 days)0.5%top 59.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.23capstone5.0.8-r0ALPINE-CVE-2026-47143
Alpine:v3.24capstone5.0.8-r0ALPINE-CVE-2026-47143
Debian:12capstoneno fix listedDEBIAN-CVE-2026-47143
Debian:13capstoneno fix listedDEBIAN-CVE-2026-47143
Debian:14capstone5.0.9-1DEBIAN-CVE-2026-47143
PyPIcapstone5.0.8PYSEC-2026-3544
Ubuntu:22.04:LTScapstoneno fix listedUBUNTU-CVE-2026-47143
Ubuntu:24.04:LTScapstoneno fix listedUBUNTU-CVE-2026-47143
Ubuntu:26.04:LTScapstoneno fix listedUBUNTU-CVE-2026-47143
Ubuntu:26.10capstoneno fix listedUBUNTU-CVE-2026-47143

Affected products (as reported)

VendorProductVersions
capstone-engine capstone < 5.0.8< 6.0.0-Alpha8

Weakness: CWE-476 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References