CVE-2026-119139 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via Func::call
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-119139?
CVE-2026-119139 is a medium-severity vulnerability in bytecodealliance wasmtime, published on 29 Oct 2026.
Official description
Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a leftover assertion in component::Func::call that rejects guest exports using the async ABI option. An attacker who supplies a component with an async-lifted export can crash the host process when an embedder invokes that export through Func::call.
Weakness: CWE-617
Which versions are affected by CVE-2026-119139?
1 open source package ship an affected version, including wasmtime.
| Package | Affected | Fixed in |
|---|---|---|
wasmtime crates.io | From 46.0.0 | 48.0.6, 49.0.3 |
How do I fix CVE-2026-119139?
Upgrade wasmtime to a fixed version for your release line: 48.0.6 or 49.0.3.
Is CVE-2026-119139 being exploited?
There is no known exploitation of CVE-2026-119139 in the wild and no public exploit code.
Sources
Also known as GHSA-6862-c5q5-q6rc, GHSA-m6w2-jwq2-cv2c, RUSTSEC-2026-0353.