Use After Free Affecting wasmtime-environ package, versions >=43.0.0 <43.0.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUST-WASMTIMEENVIRON-15967233
- published10 Apr 2026
- disclosed9 Apr 2026
- creditUnknown
Introduced: 9 Apr 2026
CVE-2026-34983 (opens in a new tab)How to fix?
Upgrade wasmtime-environ to version 43.0.1 or higher.
Overview
wasmtime-environ is a Standalone environment support for WebAssembly code in Cranelift
Affected versions of this package are vulnerable to Use After Free in the wasmtime::Linker. An attacker can cause unpredictable program behavior and potentially disrupt service by cloning and then dropping a wasmtime::Linker instance before its cloned counterpart is used.