RUSTSEC-2026-0258 - h2 unbounded empty DATA frames

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?

Informational severity, published 17 August 2026.

Which products and versions are affected?

h2 (crates.io) SEMVER:introduced=0.0.0-0,fixed=0.4.16.

Is there a fix for This vulnerability?

Yes. h2 (crates.io): upgrade to 0.4.16 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 h2 (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

• h2 (crates.io): upgrade to 0.4.16 or later

  cargo update -p h2

Affected products

• h2 (crates.io) SEMVER:introduced=0.0.0-0,fixed=0.4.16