Numeric Truncation Error Affecting wasmtime package, versions <36.0.19>=37.0.0 <43.0.0
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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- published25 Oct 2026
- disclosed23 Oct 2026
- creditUnknown
Introduced: 23 Oct 2026
NewCVE-2026-115889 (opens in a new tab)How to fix?
Upgrade wasmtime to version 36.0.19, 43.0.0 or higher.
Overview
Affected versions of this package are vulnerable to Numeric Truncation Error in the Cranelift compiler backend's bit-packing process for SSA value indices. An attacker can cause arbitrary miscompilation, type confusion, and potentially escape the WebAssembly sandbox by compiling a sufficiently large or specially crafted Wasm function with many SSA values.