CVE-2026-119141 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via realloc
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-119141?
CVE-2026-119141 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 that allows malicious Wasm modules to panic the host because the may_leave flag is not cleared during realloc. Attackers can call into the host from realloc while lowering stream or future results, such as cancelling the active read or re-waiting a waitable-set, crashing the host.
Weakness: CWE-1265
Which versions are affected by CVE-2026-119141?
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-2026-119141?
Upgrade wasmtime to a fixed version for your release line: 48.0.6 or 49.0.3.
Is CVE-2026-119141 being exploited?
There is no known exploitation of CVE-2026-119141 in the wild and no public exploit code.
Sources
Also known as GHSA-7v24-42x9-pxf7, GHSA-7w3v-6qhp-7c4h, RUSTSEC-2026-0356.