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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.

PUBLISHED Reserved 2026-03-31 | Published 2026-04-09 | Updated 2026-04-13 | Assigner GitHub_M




MEDIUM: 4.1CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-248: Uncaught Exception

Product status

< 24.0.7
affected

>= 25.0.0, < 36.0.7
affected

>= 37.0.0, < 42.0.2
affected

>= 43.0.0, < 44.0.1
affected

References

github.com/...smtime/security/advisories/GHSA-qqfj-4vcm-26hv

cve.org (CVE-2026-34944)

nvd.nist.gov (CVE-2026-34944)

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