Process crash via unchecked instruction-name indexes
Published Aug 14, 2026 · Updated Aug 14, 2026
Out-of-bounds reads in Capstone before 6.0.0-Alpha9 allow local users to crash processes through invalid M68K or RISCV instruction IDs. The M68K backend indexes s_instruction_names without a bounds check, while the RISCV alias calculation underflows before indexing insn_alias_mnem_map. Reachability requires an application or binding to pass attacker-controlled IDs to cs_insn_name() on an M68K or RISCV handle; only a deterministic process crash was demonstrated.
Summary
What happened
Out-of-bounds reads in Capstone before 6.0.0-Alpha9 allow local users to crash processes through invalid M68K or RISCV instruction IDs. The M68K backend indexes s_instruction_names without a bounds check, while the RISCV alias calculation underflows before indexing insn_alias_mnem_map. Reachability requires an application or binding to pass attacker-controlled IDs to cs_insn_name() on an M68K or RISCV handle; only a deterministic process crash was demonstrated.
The record
- CVE
- CVE-2026-49282
- Published
- Aug 14, 2026
- Updated
- Aug 14, 2026
- Vendor
- Capstone Engine
- Product
- Capstone
- Classifications
- CWE-129, CWE-191, CWE-125, T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 14, 2026CVE publishedPublication date reported by the CVE source.
- Aug 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 6.0.0-Alpha9
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA sanitizer proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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