CVE-2026-115382 Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 wasi:http Zero Timeout Panic DoS
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-115382?
CVE-2026-115382 is a medium-severity vulnerability in bytecodealliance wasmtime, published on 22 Oct 2026.
Official description
Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial-of-service vulnerability in its wasi:http implementation that allows guests to panic the host. Guests can specify a zero between-bytes-timeout request option, which is forwarded directly to a Tokio API that panics, crashing the host embedding.
Weakness: CWE-1284
Which versions are affected by CVE-2026-115382?
1 open source package ship an affected version, including wasmtime-wasi-http.
| Package | Affected | Fixed in |
|---|---|---|
wasmtime-wasi-http crates.io | From 46.0.0 | 48.0.4, 49.0.2 |
How do I fix CVE-2026-115382?
Upgrade wasmtime-wasi-http to a fixed version for your release line: 48.0.4 or 49.0.2.
Is CVE-2026-115382 being exploited?
There is no known exploitation of CVE-2026-115382 in the wild and no public exploit code.
Sources
Also known as GHSA-5gfg-32ph-pxg9, GHSA-w4qr-p94g-mjhv, RUSTSEC-2026-0320, UBUNTU-CVE-2026-115382.