CVE-2026-49282

Summary

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 Software

Weaknesses

• CWE-125: CWE-125: Out-of-bounds Read
• CWE-129: CWE-129: Improper Validation of Array Index
• CWE-191: CWE-191: Integer Underflow (Wrap or Wraparound)

References

• https://github.com/capstone-engine/capstone/security/advisories/GHSA-jrw4-wj52-2vw8
• https://github.com/capstone-engine/capstone/blob/251c5bb4bc9bb92973e738ae3c5f4ef86f103356/ChangeLog#L102

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