Capstone has a NULL Pointer Dereference with 3DNow! opcodes
Summary
| CVE | CVE-2026-47143 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-21 21:16:50 UTC |
| Updated | 2026-07-30 15:16:57 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 5.9 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.003980000 probability, percentile 0.326090000 (date 2026-08-03)
Problem Types: CWE-476 | CWE-476 CWE-476: NULL Pointer Dereference
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 5.9 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | [email protected] | Secondary | 5.1 | MEDIUM | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | CNA | DECLARED | 5.1 | MEDIUM | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Capstone-engine | Capstone | All | All | All | All |
| Application | Capstone-engine | Capstone | 6.0.0 | alpha1 | All | All |
| Application | Capstone-engine | Capstone | 6.0.0 | alpha2 | All | All |
| Application | Capstone-engine | Capstone | 6.0.0 | alpha3 | All | All |
| Application | Capstone-engine | Capstone | 6.0.0 | alpha4 | All | All |
| Application | Capstone-engine | Capstone | 6.0.0 | alpha5 | All | All |
| Application | Capstone-engine | Capstone | 6.0.0 | alpha6 | All | All |
| Application | Capstone-engine | Capstone | 6.0.0 | alpha7 | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Capstone-engine | Capstone | affected < 5.0.8 | Not specified |
| CNA | Capstone-engine | Capstone | affected < 6.0.0-Alpha8 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/capstone-engine/capstone/pull/2924 | [email protected] | github.com | Issue Tracking, Patch |
| github.com/capstone-engine/capstone/commit/a0201371719b5aaa91d318ab28988... | [email protected] | github.com | Patch |
| github.com/capstone-engine/capstone/commit/fab595205fee206f5c21be6ed8ad2... | [email protected] | github.com | Patch |
| github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | github.com | Exploit, Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.