NULL pointer dereference in Capstone-Engine Capstone
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.1 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (39.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Capstone-Engine Capstone — versions 6.0.0, < 6.0.0-Alpha8, < 5.0.8
Weakness classification (CWE)
References
- github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm (Exploit, Vendor Advisory)
- github.com/capstone-engine/capstone/pull/2924 (Patch, Issue Tracking)
- github.com/capstone-engine/capstone/commit/a0201371719b5aaa91d318ab2898843718f9… (Patch)
- github.com/capstone-engine/capstone/commit/fab595205fee206f5c21be6ed8ad2eaf9225… (Patch)
Frequently asked questions
- What is CVE-2026-47143?
- CVE-2026-47143 is a medium-severity vulnerability in Capstone-Engine Capstone, classified under NULL Pointer Dereference. CVSS score: 5.1/10. Published 2026-07-21.
- How severe is CVE-2026-47143?
- Medium severity. CVSS v3 base score is 5.1 out of 10.