CVE-2026-115380 Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains a denial of service vulnerability in the wasmtime-wasi WASI
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-115380?
CVE-2026-115380 is a medium-severity vulnerability in bytecodealliance wasmtime, published on 22 Oct 2026.
Official description
Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains a denial of service vulnerability in the wasmtime-wasi WASI preview 0 poll_oneoff adapter, which performs O(n) host work per subscription without consuming or checking fuel. Malicious guest modules can pass many subscriptions to force long-running host computation that ignores configured fuel limits.
Weakness: CWE-770
Which versions are affected by CVE-2026-115380?
1 open source package ship an affected version, including wasmtime-wasi.
| Package | Affected | Fixed in |
|---|---|---|
wasmtime-wasi crates.io | From 0.0.0-0 | 36.0.17, 48.0.4, 49.0.2 |
How do I fix CVE-2026-115380?
Upgrade wasmtime-wasi to a fixed version for your release line: 36.0.17, 48.0.4 or 49.0.2.
Is CVE-2026-115380 being exploited?
There is no known exploitation of CVE-2026-115380 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-115380, GHSA-85gj-cvfx-w74q, GHSA-j366-h8gg-77pm, RUSTSEC-2026-0321, UBUNTU-CVE-2026-115380.