CVE-2026-119142 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via call_async Drop
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-119142?
CVE-2026-119142 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 denial of service vulnerability where dropping the Future returned by TypedFunc::call_async can panic the host. When the guest task has not started, cleanup code searches only one location for work items and unwraps the resulting error, crashing embedders that cancel pending calls.
Weakness: CWE-617
Which versions are affected by CVE-2026-119142?
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-2026-119142?
Upgrade wasmtime to a fixed version for your release line: 48.0.6 or 49.0.3.
Is CVE-2026-119142 being exploited?
There is no known exploitation of CVE-2026-119142 in the wild and no public exploit code.
Sources
Also known as GHSA-3r89-v5mq-j5xf, GHSA-x9q9-vvfc-mrm5, RUSTSEC-2026-0354.