CVE-2026-34944

MEDIUM

5.7

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.

CVE Details

CVSS v3.1 Score5.7

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionREQUIRED

Published4/9/2026

Last Modified4/20/2026

Sourcenvd

Honeypot Sightings0

Affected Products

bytecodealliance:wasmtime

Weaknesses (CWE)

CWE-248

References

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-qqfj-4vcm-26hv(security-advisories@github.com)

IOC Correlations

No correlations recorded

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