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    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:Jul 21, 2026
    Last Modified:Jul 24, 2026
    EPS:Jul 21, 2026
    EPSS Score:0.00177
    CVSS Score:5.1

    Affected Products

    Vendor
    Capstone-engine
    Product
    Capstone

    Exploits

    https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrmhttps://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High