CVE-2026-34944
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| bytecodealliance | wasmtime | < 24.0.7 | affected |
| bytecodealliance | wasmtime | >= 25.0.0, < 36.0.7 | affected |
| bytecodealliance | wasmtime | >= 37.0.0, < 42.0.2 | affected |
| bytecodealliance | wasmtime | >= 43.0.0, < 44.0.1 | affected |
Weaknesses
- CWE-248: CWE-248: Uncaught Exception
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
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