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CVE-2026-55893— Capstone SH disassembler `set_reg_n` heap buffer overflow via crafted SH2A FPU bytecode

Quick assessment

Affected
capstone-engine capstone
Exploitation
Public or AI PoC available; prioritize validation
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 浮点解码器（如 opFADD、opFMUL 和 opFSUB）在调用 set_reg() 和 set_reg_n() 时，使用了 sh_info.op.op_count 作为索引，但未对固定大小的 operands[] 数组进行边界检查。 通过 cs_disasm_iter() 或 cs_disasm() 函数，反复处理针对 CS_ARCH_SH 架

CVSS 7.3 · High EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
capstone-engine capstone < 6.0.0-Alpha10 affected
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I. Basic Information for CVE-2026-55893

Vulnerability Information
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Vulnerability Title
Capstone SH disassembler `set_reg_n` heap buffer overflow via crafted SH2A FPU 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 floating-point decoders such as opFADD, opFMUL, and opFSUB call set_reg() and set_reg_n() using sh_info.op.op_count without checking the fixed-size operands[] array. Repeated crafted instructions processed through cs_disasm_iter() or cs_disasm() with CS_ARCH_SH, CS_MODE_SH2A or CS_MODE_SH4A, CS_MODE_SHFPU, and CS_OPT_DETAIL can increment the operand count beyond the 176-byte sh_info allocation and perform a four-byte heap buffer overflow write. The corruption can crash the process and may enable code execution depending on heap layout. This issue is fixed in version 6.0.0-Alpha10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
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-2026-55893

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8661 chars
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III. Intelligence Information for CVE-2026-55893

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Patches & Fixes for CVE-2026-55893 (4)

Vendor Advisories for CVE-2026-55893 (1)

Vendor Pages for CVE-2026-55893 (1)

IV. Related Vulnerabilities

Same product: capstone
Same vendor: capstone-engine
Same weakness: CWE-122

V. Comments for CVE-2026-55893

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