CVE-2026-115390 Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 Fuel Accounting Bypass DoS
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-115390?
CVE-2026-115390 is a medium-severity vulnerability in bytecodealliance wasmtime, published on 22 Oct 2026.
Official description
Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 contains a fuel accounting flaw in Cranelift-compiled call_ref and try_table catch paths. Malicious guests can reset consumed fuel after calls to run exponentially long on linear fuel, evading timeouts and periodic yields for denial of service.
Weakness: CWE-400
Which versions are affected by CVE-2026-115390?
1 open source package ship an affected version, including wasmtime.
| Package | Affected | Fixed in |
|---|---|---|
wasmtime crates.io | From 47.0.0 | 48.0.3, 49.0.1 |
How do I fix CVE-2026-115390?
Upgrade wasmtime to a fixed version for your release line: 48.0.3 or 49.0.1.
Is CVE-2026-115390 being exploited?
There is no known exploitation of CVE-2026-115390 in the wild and no public exploit code.
Sources
Also known as GHSA-78f8-6g96-699x, GHSA-m63x-6p34-q65x, RUSTSEC-2026-0315, UBUNTU-CVE-2026-115390.