CVE-2026-55894

Summary

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.

Affected Software

Weaknesses

• CWE-125: CWE-125: Out-of-bounds Read

References

• https://github.com/capstone-engine/capstone/security/advisories/GHSA-gf2c-xwcp-hvf4
• https://github.com/capstone-engine/capstone/pull/2968
• https://github.com/capstone-engine/capstone/pull/2969
• https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e
• https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed
• https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10

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