Always-Incorrect Control Flow Implementation Affecting wasmtime package, versions >=25.0.0 <36.0.7>=37.0.0 <42.0.2>=43.0.0 <43.0.1
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Test your applications- Snyk IDSNYK-RUST-WASMTIME-15967359
- published10 Apr 2026
- disclosed9 Apr 2026
- creditUnknown
Introduced: 9 Apr 2026
NewCVE-2026-34946 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade wasmtime to version 36.0.7, 42.0.2, 43.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Always-Incorrect Control Flow Implementation when table.fill is executed by the Winch compiler. An attacker can cause the system to crash and become unavailable by submitting a specially crafted WebAssembly program that triggers improper handling of certain instructions.