CVE-2026-47143: Capstone is a disassembly framework

Q: How do I fix CVE-2026-47143?

capstone: upgrade to 5.0.8. Exact commands for each OS are on this page.

Q: Is CVE-2026-47143 being exploited?

CVE-2026-47143 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-47143 affect?

CVE-2026-47143 affects capstone. Severity is medium (CVSS 5.1). 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`, a

Q: How urgent is CVE-2026-47143?

Priority 33/100. Public exploit reference

Routine

MEDIUM 5.1UPGRADE

CVE-2026-47143 is a medium-severity flaw (CVSS 5.1) affecting capstone. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 patc

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.1 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-476
Published	2026-07-21
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc. · Vendor: capstone-engine

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-21 21:16 UTCPublished CVE record published
2026-10-24 19:10 UTCUpdated Record last modified

capstone-engine capstone UPGRADE

Affected: < 5.0.8 · 6.0.0 alpha1 · 6.0.0 alpha2 · 6.0.0 alpha3 · 6.0.0 alpha4 · 6.0.0 alpha5 · 6.0.0 alpha6 · 6.0.0 alpha7

Fixed in: 5.0.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy capstone || rpm -q capstone || capstone --version

2. UPGRADE to 5.0.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade capstone

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade capstone

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47143?

capstone: upgrade to 5.0.8. Exact commands for each OS are on this page.

Is CVE-2026-47143 being exploited?

CVE-2026-47143 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47143 affect?

CVE-2026-47143 affects capstone. Severity is medium (CVSS 5.1). 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`, a

How urgent is CVE-2026-47143?

Priority 33/100. Public exploit reference

References

← Back to latest CVEs