CVE catalog

CVE-2026-47143

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

[CVE catalog]

Severity: Medium · CVSS 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jul 21, 2026, 8:10:44 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.47% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	capstone	sid	`5.0.9-1`	fixed
Debian	capstone	forky	`5.0.9-1`	fixed
Debian	capstone	trixie	`5.0.7-1~deb13u1`	vulnerable
Debian	capstone	bookworm	`4.0.2-5`	vulnerable
Cpe	capstone	Not reported	Not reported	unknown

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	capstone	source	sid	`5.0.9-1`	not yet assigned	Not reported	[1142678]
Debian	capstone	source	forky	`5.0.9-1`	not yet assigned	Not reported	[1142678]
Debian	capstone	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1142678]
Debian	capstone	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1142678]

[Debian bug #1142678]

Notes

[trixie] capstone: Minor issue [bookworm] capstone: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[capstone-tool]Affected
Source package: [capstone]
Details (2)
- 4.0.2-5 · amd64 · bookworm
  Affected
  nvd · capstone · debian · bookworm; nvd · capstone · debian · 12
- 4.0.2-5 · arm64 · bookworm
  Affected
  nvd · capstone · debian · bookworm; nvd · capstone · debian · 12
[libcapstone4]Affected
Source package: [capstone]
Details (2)
- 4.0.2-5 · amd64 · bookworm
  Affected
  nvd · capstone · debian · bookworm; nvd · capstone · debian · 12
- 4.0.2-5 · arm64 · bookworm
  Affected
  nvd · capstone · debian · bookworm; nvd · capstone · debian · 12
[libcapstone-dev]Affected
Source package: [capstone]
Details (2)
- 4.0.2-5 · amd64 · bookworm
  Affected
  nvd · capstone · debian · bookworm; nvd · capstone · debian · 12
- 4.0.2-5 · arm64 · bookworm
  Affected
  nvd · capstone · debian · bookworm; nvd · capstone · debian · 12
[python3-capstone]Affected
Source package: [capstone]
Details (2)
- 4.0.2-5 · amd64 · bookworm
  Affected
  nvd · capstone · debian · bookworm; nvd · capstone · debian · 12
- 4.0.2-5 · arm64 · bookworm
  Affected
  nvd · capstone · debian · bookworm; nvd · capstone · debian · 12

[Debian 13 (Trixie)]

[capstone-tool]Affected
Source package: [capstone]
Details (2)
- 5.0.7-1~deb13u1 · amd64 · trixie
  Affected
  nvd · capstone · debian · 13
- 5.0.7-1~deb13u1 · arm64 · trixie
  Affected
  nvd · capstone · debian · 13
[libcapstone5]Affected
Source package: [capstone]
Details (2)
- 5.0.7-1~deb13u1 · amd64 · trixie
  Affected
  nvd · capstone · debian · 13
- 5.0.7-1~deb13u1 · arm64 · trixie
  Affected
  nvd · capstone · debian · 13
[libcapstone-dev]Affected
Source package: [capstone]
Details (2)
- 5.0.7-1~deb13u1 · amd64 · trixie
  Affected
  nvd · capstone · debian · 13
- 5.0.7-1~deb13u1 · arm64 · trixie
  Affected
  nvd · capstone · debian · 13
[python3-capstone]Affected
Source package: [capstone]
Details (2)
- 5.0.7-1~deb13u1 · amd64 · trixie
  Affected
  nvd · capstone · debian · 13
- 5.0.7-1~deb13u1 · arm64 · trixie
  Affected
  nvd · capstone · debian · 13

Observed: Oct 24, 2026, 7:19:36 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]