RUSTSEC-2026-0258: h2 unbounded empty DATA frames

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
74/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
rust
Domain
security

Research direction

Search the Cargo manifests and lockfile for the h2 dependency at version 0.4.13. Update it to the patched 0.4.16 or later, then run the relevant Cargo tests and dependency checks; done means the repository no longer resolves the vulnerable version.

Written by the indexing model from the issue text.

Description

h2 unbounded empty DATA frames

Details
Package h2
Version 0.4.13
URL https://github.com/hyperium/hyper/security/advisories/GHSA-q83h-524g-xf6h
Date 2026-08-17
Patched versions >=0.4.16

The h2 crate, used internally by hyper, had a flaw that would accept and queue empty DATA frames without limit.
If streams were not actively drained, this could lead to unbounded memory usage, or a panic if the length overflows.

Low severity.

Patched in v0.4.16.

See advisory page for additional details.

Dominant language
Rust
Stars
1.2k
Forks
266
Avg merge
10d 5h
Merged PRs (30d)
4

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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