Medium severity5.7NVD Advisory· Published Apr 9, 2026· Updated Apr 20, 2026
CVE-2026-34944
CVE-2026-34944
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
wasmtimecrates.io | < 24.0.7 | 24.0.7 |
wasmtimecrates.io | >= 25.0.0, < 36.0.7 | 36.0.7 |
wasmtimecrates.io | >= 37.0.0, < 42.0.2 | 42.0.2 |
wasmtimecrates.io | >= 43.0.0, < 43.0.1 | 43.0.1 |
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- github.com/advisories/GHSA-qqfj-4vcm-26hvghsaADVISORY
- github.com/bytecodealliance/wasmtime/security/advisories/GHSA-qqfj-4vcm-26hvnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-34944ghsaADVISORY
- rustsec.org/advisories/RUSTSEC-2026-0087.htmlghsaWEB
News mentions
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