CVE-2026-34944
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.
- Score
- CVSS 3.1 5.7 Medium
- Status
- Analyzed - security-advisories@github.com
- Published
- 2026-04-09
- Last modified
- 2026-10-26
- Weaknesses
- CWE-248
Affected products
References
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-qqfj-4vcm-26hv
