Out-of-bounds Read Affecting wasmtime-environ package, versions <24.0.7>=25.0.0 <36.0.7>=37.0.0 <42.0.2>=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-15967276
- published10 Apr 2026
- disclosed9 Apr 2026
- creditShun Kashiwa
Introduced: 9 Apr 2026
CVE-2026-34941 (opens in a new tab)How to fix?
Upgrade wasmtime-environ to version 24.0.7, 36.0.7, 42.0.2, 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 Out-of-bounds Read in the string transcoding of a UTF-16 string to the latin1+utf16. An attacker can cause the host process to terminate unexpectedly or potentially access sensitive information by providing a specially crafted UTF-16 string that is incorrectly validated. This is only exploitable if guard pages are disabled.