CVE-2026-47143Public exploitNetwork attack vector

Application crash via reduced-build 3DNow! decoding

Published Jul 21, 2026 · Updated Jul 21, 2026

NULL pointer dereference in Capstone before 5.0.8 or before 6.0.0-Alpha8 allows remote attackers to crash reduced-X86 applications. In CAPSTONE_X86_REDUCE builds, readOpcode() assigns THREEDNOW_MAP for 0F 0F, but guarded cases leave indextable or dec NULL before dereference. The crash requires an application to disassemble attacker-supplied x86 or x86-64 bytes with the reduced library and interrupts only that process unless Capstone runs in a kernel context.

CVSS severity5.1
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Capstone before 5.0.8 or before 6.0.0-Alpha8 allows remote attackers to crash reduced-X86 applications. In CAPSTONE_X86_REDUCE builds, readOpcode() assigns THREEDNOW_MAP for 0F 0F, but guarded cases leave indextable or dec NULL before dereference. The crash requires an application to disassemble attacker-supplied x86 or x86-64 bytes with the reduced library and interrupts only that process unless Capstone runs in a kernel context.

The record

CVE
CVE-2026-47143
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Capstone Engine
Product
Capstone
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.0.8
  2. Affected versionversion=< 6.0.0-Alpha8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Capstone Engine · Capstoneversion=< 5.0.8; version=< 6.0.0-Alpha8

Published CVSS scores

5.1GitHub, Inc.CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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