CVE-2026-55894

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.

References

https://github.com/capstone-engine/capstone/security/advisories/GHSA-gf2c-xwcp-hvf4

https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10

https://github.com/capstone-engine/capstone/pull/2969

https://github.com/capstone-engine/capstone/pull/2968

https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed

https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS