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CVE-2026-55894

CVE-2026-55894 · Capstone SH disassembler `sh_disassemble` out-of-bounds read via crafted SH2A bytecode

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Capstone is a disassembly framework. In 6.0.0-Alpha9 and earlier, Capstone's arch/SH/SHDisassembler.c sh_disassemble() function computes an idx value from a raw 16-bit instruction without ensuring it is within the active mode-specific decode[] function-pointer table. An application using CS_ARCH_SH with CS_MODE_SH2A or CS_MODE_SH4A and CS_MODE_SHFPU can pass crafted bytecode through cs_disasm_iter() or cs_disasm(), causing the decode[idx] test to read outside the table and terminate the process with a segmentation fault. No code execution or information disclosure was demonstrated. This issue is fixed in version 6.0.0-Alpha10.

CVSS 6.8 · Medium · EPSS 0.2%

Published
Updated

Stack: system

Affected products and versions

  • capstone

    Versions
    • < 6.0.0-Alpha10: Affected

    No fix published

  • capstone Debian:12

    Versions
    • 4.0.2-5
    • 4.0.2-5.1
    • 5.0-1~exp1
    • 5.0.1-1~exp1
    • 5.0.3-1
    • 5.0.5-1
    • 5.0.6-1
    • 5.0.7-1
    • 5.0.7-1~deb13u1
    • 5.0.7-2
    • 5.0.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • capstone Debian:13

    Versions
    • 5.0.6-1
    • 5.0.7-1
    • 5.0.7-1~deb13u1
    • 5.0.7-2
    • 5.0.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • capstone Debian:14

    Versions
    • 5.0.6-1
    • 5.0.7-1
    • 5.0.7-1~deb13u1
    • 5.0.7-2
    • 5.0.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • capstone Ubuntu:16.04:LTS

    Versions
    • 3.0.4-0.1
    • 3.0.4-0.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • capstone Ubuntu:18.04:LTS

    Versions
    • 3.0.4-3
    • 3.0.4-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • capstone Ubuntu:20.04:LTS

    Versions
    • 4.0.1+really+3.0.5-1
    • 4.0.1+really+3.0.5-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • capstone Ubuntu:22.04:LTS

    Versions
    • 4.0.2-3
    • 4.0.2-3build1
    • 4.0.2-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • capstone Ubuntu:24.04:LTS

    Versions
    • 4.0.2-5
    • 4.0.2-5ubuntu1
    • 4.0.2-5.1
    • 4.0.2-5.1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • capstone Ubuntu:26.10

    Versions
    • 5.0.7-2
    • 5.0.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • capstone Ubuntu:26.04:LTS

    Versions
    • 5.0.6-1
    • 5.0.6-1build1
    • 5.0.7-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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