Memory Allocation with Excessive Size Value 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-15967400
- published10 Apr 2026
- disclosed9 Apr 2026
- creditUnknown
Introduced: 9 Apr 2026
NewCVE-2026-35186 (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 Memory Allocation with Excessive Size Value in the handling of the table.grow operator by the Winch compiler backend, which leads to an internal type mismatch. An attacker can cause the host process to crash or potentially access up to 16 bytes of sensitive host data by triggering this flaw. This is only exploitable if memory guard pages are disabled.