CVE-2026-119136 Wasmtime 42.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Async-Entrypoint Enforcement Bypass
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-119136?
CVE-2026-119136 is a medium-severity vulnerability in bytecodealliance wasmtime, published on 29 Oct 2026.
Official 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.
Weakness: CWE-1265
Which versions are affected by CVE-2026-119136?
1 open source package ship an affected version, including wasmtime.
| Package | Affected | Fixed in |
|---|---|---|
wasmtime crates.io | From 42.0.0 | 48.0.6, 49.0.3 |
How do I fix CVE-2026-119136?
Upgrade wasmtime to a fixed version for your release line: 48.0.6 or 49.0.3.
Is CVE-2026-119136 being exploited?
There is no known exploitation of CVE-2026-119136 in the wild and no public exploit code.
Sources
Also known as GHSA-vcg5-q8m5-8379, GHSA-xp2q-mv29-hr2p, RUSTSEC-2026-0362.