🛡️ CVE-2026-47143 — capstone

🟡 CVSS 5.1 — Medium ⚠️ Exploit Public CWE-476 OSV
5.1
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2026-47143 is classified as CWE-476: NULL Pointer Dereference. A pointer that can be null is used without a check, crashing the process.

Affected software

CVE-2026-47143 is recorded against 1 package.

  • capstone (fixed in 5.0.8)

Timeline and source

Published on 21 July 2026 and last revised on 31 July 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Fix)
github.com (Fix)
github.com (Fix)
github.com (Evidence)

Details

Severity MEDIUM
CVSS Score 5.1
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-476
Public Exploit ⚠️ Yes
Source OSV
Published 2026-07-21
Updated 2026-08-12
Modified 2026-07-31

Affected Packages

Software From version Fixed in
capstone — 5.0.8

Exploit Protection

Are you running capstone?

CVE-2026-47143 carries CVSS 5.1 Medium rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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