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.
Fix
Patch, vendor advisory and mitigation references on NVD 1
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-qqfj-4vcm-26hv Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 4.1 · bytecodeallianceNVD modified 2026-10-26 22:10
Affected (CPE criteria) 1
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*