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

Quick assessment

Affected
capstone-engine capstone
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Capstone 是一个反汇编框架。在 6.0.0-Alpha9 及更早版本中，Capstone 的 arch/SH/SHDisassembler.c 文件中的 sh_disassemble() 函数会从原始 16 位指令中计算一个索引值（idx），但未确保该索引值位于活动模式下对应的 decode[] 函数指针表的合法范围内。当应用程序使用 CS_ARCH_SH，并配置为 CS_MODE_SH2A 或 CS_MODE_SH4A 以及 CS_MODE_SHFPU 模式时，可通过 cs_disasm_iter() 或

CVSS 6.8 · Medium EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
capstone-engine capstone < 6.0.0-Alpha10 affected
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I. Basic Information for CVE-2026-55894

Vulnerability Information
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Vulnerability Title
Capstone SH disassembler `sh_disassemble` out-of-bounds read via crafted SH2A bytecode
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
capstone-engine capstone < 6.0.0-Alpha10 -

II. Public POCs for CVE-2026-55894

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III. Intelligence Information for CVE-2026-55894

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Patches & Fixes for CVE-2026-55894 (4)

Vendor Advisories for CVE-2026-55894 (1)

Vendor Pages for CVE-2026-55894 (1)

IV. Related Vulnerabilities

Same product: capstone
Same vendor: capstone-engine
Same weakness: CWE-125

V. Comments for CVE-2026-55894

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