Quick answers
- Is This vulnerability exploited in the wild?
- No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
- How severe is This vulnerability?
- Medium severity, with a CVSS score of 4, published 14 October 2026.
- Which products and versions are affected?
- Bytecode Alliance Wasmtime 47.0.0 through 48.0.5, 49.0.0 through 49.0.2; wasmtime (crates.io) SEMVER:introduced=47.0.0,fixed=48.0.6,introduced=49.0.0,fixed=49.0.3.
- Is there a fix for This vulnerability?
- Yes. wasmtime (crates.io): upgrade to 49.0.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is This vulnerability attacked?
- It is attacked over the network.
- Am I affected?
- Check whether you run Bytecode Alliance Wasmtime or wasmtime (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- wasmtime (crates.io): upgrade to 49.0.3 or later
cargo update -p wasmtime
Technical details
Exception tag handling in Wasmtime can cause host data structures to be unaligned, a memory corruption issue that may lead to integrity impacts. The vulnerability affects WebAssembly code that uses exception handling features and requires authenticated access and user interaction to exploit. A fix is available in versions 48.0.6+ and 49.0.3+.
Affected products
- Bytecode Alliance Wasmtime 47.0.0 through 48.0.5, 49.0.0 through 49.0.2
Identifiers
- GHSA-p79w-pv2r-29qp
- RUSTSEC-2026-0364
Timeline
- 2026-10-14: disclosed