CVE-2026-115393 Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 contains a type confusion vulnerability becau
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-115393?
CVE-2026-115393 is a low-severity vulnerability in bytecodealliance wasmtime, published on 22 Oct 2026.
Official description
Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 contains a type confusion vulnerability because several Store APIs fail to validate that objects belong to the Store's Engine. Embedders mixing objects between Engines via Instance::new, StructRefPre::new, or Tag::new can trigger trampoline signature mismatches causing out-of-bounds stack writes, GC heap corruption, or panics.
Weakness: CWE-787
Which versions are affected by CVE-2026-115393?
1 open source package ship an affected version, including wasmtime.
| Package | Affected | Fixed in |
|---|---|---|
wasmtime crates.io | From 0.0.0-0 | 24.0.12, 36.0.13, 46.0.2, 47.0.3 |
How do I fix CVE-2026-115393?
Upgrade wasmtime to a fixed version for your release line: 24.0.12, 36.0.13, 46.0.2 or 47.0.3.
Is CVE-2026-115393 being exploited?
There is no known exploitation of CVE-2026-115393 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-115393, GHSA-hgjw-h833-99q9, GHSA-hm3j-7f84-9x3r, RUSTSEC-2026-0222, UBUNTU-CVE-2026-115393.