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CVE-2026-34944

nvd nist
Published: Apr 9, 2026Modified: Jun 17, 2026

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4.1
Vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XShow less
Source: security-advisories@github.com (Secondary)

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 (4)

Bytecodealliance
1 product
Wasmtime
Configuration A
4 vulnerable
Vulnerable SoftwareAffected Versions
Bytecodealliance
Wasmtime
Before 24.0.7
Wasmtime
From 25.0.0 to 36.0.7
Wasmtime
From 37.0.0 to 42.0.2
Wasmtime
From 43.0.0 to 43.0.1

Related CWEs

CWE-248
Uncaught Exception
An exception is thrown from a function, but it is not caught.

References (1)

Source: security-advisories@github.com
Vendor Advisory

Timeline

No history available yet.