CVE-2026-47143

Name	CVE-2026-47143
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1142678

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
capstone (PTS)	bullseye	4.0.2-3	vulnerable
	bookworm	4.0.2-5	vulnerable
	trixie	5.0.7-1~deb13u1	vulnerable
	forky, sid	5.0.9-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
capstone	source	(unstable)	5.0.9-1			1142678

Notes

[trixie] - capstone <no-dsa> (Minor issue)
[bookworm] - capstone <postponed> (Minor issue)
[bullseye] - capstone <postponed> (Minor issue)
https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm
https://github.com/capstone-engine/capstone/pull/2924
Fixed by: https://github.com/capstone-engine/capstone/commit/fab595205fee206f5c21be6ed8ad2eaf9225f1c7 (5.0.8)