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Fencer Vulns
medium 5.1

CVE-2026-47143 json

Capstone has a NULL Pointer Dereference with 3DNow! opcodes

published 2026-07-21 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-46398 , GHSA-289w-cm54-fgrm , PYSEC-2026-3544

cvss
5.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi capstone 5.0.8
  • capstone-engine capstone 5.0.8, 6.0.0-alpha8
  • capstone Debian 14 5.0.9-1

debian advisories DEBIAN-CVE-2026-47143

  • capstone hummingbird 1 5.0.8-0.1.hum1
  • capstone-java hummingbird 1 5.0.8-0.1.hum1
  • python3-capstone hummingbird 1 5.0.8-0.1.hum1

red hat advisories RHSA-2026:43841

  • capstone Alpine 3.24, Alpine 3.23 5.0.8-r0

alpine advisories ALPINE-CVE-2026-47143

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rust Azure Linux 3.0 1.90.0-10

azure linux advisories AZL-93312

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-47143 updated cvss 5.9

capstone: Capstone: Denial of Service vulnerability via crafted input

  • Red Hat Hardened Images capstone 5.0.8-0.1.hum1, capstone-java 5.0.8-0.1.hum1, python3-capstone 5.0.8-0.1.hum1
    fixed: vendor fix RHSA-2026:43841
  • Red Hat Enterprise Linux 9 capstone, capstone-java, python3-capstone Red Hat Enterprise Linux 10 capstone Red Hat Hardened Images rust 1.97.1-1.hum1, ruby4.0 4.0.5-35.hum1, ruby3.4 3.4.10-31.hum1, ruby3.3 3.3.10-23.4.hum1 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.1 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi capstone
<5.0.8
5.0.8

Affected products

  • capstone-engine capstone

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.