CVE-2026-55894

UNKNOWN 0.0

Capstone SH disassembler `sh_disassemble` out-of-bounds read via crafted SH2A bytecode

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-125
Vendor	capstone-engine
Product	capstone
Published	Aug 20, 2026

Stay Ahead of the Next One

Get instant alerts for capstone-engine capstone

Be the first to know when new unknown vulnerabilities affecting capstone-engine capstone are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

Affected Versions

capstone-engine / capstone

< 6.0.0-Alpha10

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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