CVE-2026-119134 Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 caps component-model resource handle tables only per component insta
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-119134?
CVE-2026-119134 is a medium-severity vulnerability in bytecodealliance wasmtime, published on 29 Oct 2026.
Official description
Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 caps component-model resource handle tables only per component instance and does not charge handle allocations to any ResourceLimiter or StoreLimits. A malicious guest can repeatedly call resource.new and instantiate sub-components to exceed the per-instance cap many times over, causing unbounded host memory growth.
Weakness: CWE-770
Which versions are affected by CVE-2026-119134?
1 open source package ship an affected version, including wasmtime.
| Package | Affected | Fixed in |
|---|---|---|
wasmtime crates.io | From 0.0.0-0 | 36.0.18, 48.0.6, 49.0.3 |
How do I fix CVE-2026-119134?
Upgrade wasmtime to a fixed version for your release line: 36.0.18, 48.0.6 or 49.0.3.
Is CVE-2026-119134 being exploited?
There is no known exploitation of CVE-2026-119134 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-119134, GHSA-59gg-q3p6-vwvr, GHSA-q554-3cjc-rx7p, RUSTSEC-2026-0363.