RUSTSEC-2026-0422 - Typed functions with `i31` or `nullref` arguments may panic due to insufficient type-check

Severity: low · CVSS 3.1 · Published 2026-10-29

Typed functions with `i31` or `nullref` arguments may panic due to insufficient type-check

Technologies: wasmtime (crates.io). Vendors: crates.io.

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?
Low severity, with a CVSS score of 3.1, published 29 October 2026.
Which products and versions are affected?
wasmtime (crates.io) SEMVER:introduced=47.0.0,fixed=48.0.8,introduced=49.0.0,fixed=49.0.5,introduced=50.0.0,fixed=50.0.1.
Is there a fix for This vulnerability?
Yes. wasmtime (crates.io): upgrade to 50.0.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected?
Check whether you run 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 50.0.1 or later
    cargo update -p wasmtime

Affected products

  • wasmtime (crates.io) SEMVER:introduced=47.0.0,fixed=48.0.8,introduced=49.0.0,fixed=49.0.5,introduced=50.0.0,fixed=50.0.1

Identifiers

  • GHSA-3982-jqvv-277m
  • RUSTSEC-2026-0422

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