CVE-2026-119136

Medium

Description

Wasmtime 42.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains insufficient checks in Store when mixing async-style and sync-style WebAssembly calls. Embedders re-entering WebAssembly via sync APIs from host functions called asynchronously can trigger runtime panics or unsound cross-thread movement of !Send host variables.

SeverityMedium

CVSS4.8

Exploit probability—

ProductBytecodealliance Wasmtime

PublishedOct 29, 2026

First seenNov 4, 2026

Weakness typeCWE-1265CWE-1265

How to fix

Update

bytecodealliance wasmtime48.0.6, 49.0.3 or later

Vendor advisories

github.com/bytecodealliance/wasmtime/security/advisories/GHSA-vcg5-q8m5-8379

Affected products

Product	Affected versions	Fixed in
bytecodealliance wasmtime	42.0.0 ≤ v < 48.0.6, 49.0.0 ≤ v < 49.0.3	48.0.6, 49.0.3

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