CVE-2026-55893

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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e
https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed
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-rxwh

Configurations

No configuration.

History

18 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) Capstone es un framework de desensamblado. En 6.0.0-Alpha9 y anteriores, los decodificadores de punto flotante SH de arch/SH/SHDisassembler.c de Capstone, como opFADD, opFMUL y opFSUB, llaman a set_reg() y set_reg_n() usando sh_info.op.op_count sin verificar el array de tamaño fijo operands[]. Instrucciones manipuladas repetidas procesadas a través de cs_disasm_iter() o cs_disasm() con CS_ARCH_SH, CS_MODE_SH2A o CS_MODE_SH4A, CS_MODE_SHFPU y CS_OPT_DETAIL pueden incrementar el contador de operandos más allá de la asignación sh_info de 176 bytes y realizar una escritura de desbordamiento de búfer de pila (heap) de cuatro bytes. La corrupción puede bloquear el proceso y puede permitir la ejecución de código dependiendo del diseño de la pila (heap). Este problema está solucionado en la versión 6.0.0-Alpha10.

Information

Published : 2026-08-20 22:17

Updated : 2026-10-18 20:10

NVD link : CVE-2026-55893

Mitre link : CVE-2026-55893

CVE.ORG link : CVE-2026-55893

JSON object : View

Products Affected

No product.

CWE

CWE-122

Heap-based Buffer Overflow

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