CVE-2026-115379 Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via try_call
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-115379?
CVE-2026-115379 is a medium-severity vulnerability in bytecodealliance wasmtime, published on 22 Oct 2026.
Official description
Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a missing GC rooting vulnerability that leaves references live across try_call unrooted when compiling Wasm modules. Attackers can supply Wasm modules whose callee triggers garbage collection, leaving stale or dangling references that cause GC heap corruption or incorrect execution.
Weakness: CWE-416
Which versions are affected by CVE-2026-115379?
1 open source package ship an affected version, including wasmtime.
| Package | Affected | Fixed in |
|---|---|---|
wasmtime crates.io | From 47.0.0 | 48.0.4, 49.0.2 |
How do I fix CVE-2026-115379?
Upgrade wasmtime to a fixed version for your release line: 48.0.4 or 49.0.2.
Is CVE-2026-115379 being exploited?
There is no known exploitation of CVE-2026-115379 in the wild and no public exploit code.
Sources
Also known as AZL-111080, AZL-111092, GHSA-gjjx-5mxw-qhf8, GHSA-hw8m-q44c-ggrf, RUSTSEC-2026-0326, UBUNTU-CVE-2026-115379.