CVE-2026-34944
Published: Apr 9, 2026
Modified: Apr 13, 2026
Description
Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, On x86-64 platforms with SSE3 disabled Wasmtime's compilation of the f64x2.splat WebAssembly instruction with Cranelift may load 8 more bytes than is necessary. When signals-based-traps are disabled this can result in a uncaught segfault due to loading from unmapped guard pages. With guard pages disabled it's possible for out-of-sandbox data to be loaded, but this data is not visible to WebAssembly guests. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.
| Vendor | Product | Versions |
|---|---|---|
bytecodealliance | wasmtime | affected < 24.0.7affected >= 25.0.0, < 36.0.7affected >= 37.0.0, < 42.0.2affected >= 43.0.0, < 44.0.1 |
Weaknesses (CWE)
References
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