CVE-2026-49282: Capstone-Engine Capstone

Medium severity, CVSS 5.1. EPSS: 0.2% chance of exploitation in the next 30 days.

Capstone is a disassembly framework. Prior to version 6.0.0-Alpha9, Capstone's public `cs_insn_name()` API forwards caller-supplied instruction IDs directly to the selected architecture backend. Most backends validate the ID before indexing instruction-name tables, but the M68K and RISCV backends have missing or incomplete bounds checks. On a Capstone handle opened for M68K or RISCV, a caller-controlled invalid instruction ID can trigger an out-of-bounds read and crash the process. The demonstrated impact is availability loss in applications or bindings that expose instruction-name lookup to untrusted IDs. No code execution or data disclosure was demonstrated. Version 6.0.0-Alpha9 patches the issue.

Affected products

• Capstone-Engine Capstone: before 6.0.0-Alpha9 (fixed in 6.0.0-Alpha9)

Published 2026-08-14. Last modified 2026-09-18.