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.
References6
- github.com/capstone-engine/capstone/commit/09e76802380b9e94d972…
- github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b…
- github.com/capstone-engine/capstone/pull/2968
- github.com/capstone-engine/capstone/pull/2969
- github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10
- github.com/capstone-engine/capstone/security/advisories/GHSA-3h…
Metrics
- CVSS 4.0
-
7.3
HIGH
Score source: CNA
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 8 · as of 10 November 2026
- CWE
- CWE-122
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