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.
Related Weaknesses (CWE)
References
- https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9
- https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f9
- https://github.com/capstone-engine/capstone/pull/2968
- https://github.com/capstone-engine/capstone/pull/2969
- https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10
- https://github.com/capstone-engine/capstone/security/advisories/GHSA-3hpv-wr3j-r
FAQ
What is CVE-2026-55893?
CVE-2026-55893 is a documented vulnerability. 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...
How severe is CVE-2026-55893?
CVSS scoring is not yet available for CVE-2026-55893. Check NVD for updates.
Is there a patch for CVE-2026-55893?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.