Vulnerability-Lookup

rustsec-2026-0258

Vulnerability from osv_rustsec

Published

2026-08-17 12:00

Modified

2026-08-18 08:23

Summary

h2 unbounded empty DATA frames

Details

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.

References

URL

Type

	https://crates.io/crates/h2	PACKAGE
	https://rustsec.org/advisories/RUSTSEC-2026-0258.html	ADVISORY
	https://github.com/hyperium/hyper/security/adviso…	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "denial-of-service"
        ],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "h2",
        "purl": "pkg:cargo/h2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.4.16"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "GHSA-q83h-524g-xf6h"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "The h2 crate, used internally by hyper, had a flaw that would accept and queue empty DATA frames without limit.\nIf streams were not actively drained, this could lead to unbounded memory usage, or a panic if the length overflows.\n\nLow severity.\n\nPatched in v0.4.16.",
  "id": "RUSTSEC-2026-0258",
  "modified": "2026-08-18T08:23:07Z",
  "published": "2026-08-17T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/h2"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0258.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/hyperium/hyper/security/advisories/GHSA-q83h-524g-xf6h"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "h2 unbounded empty DATA frames"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.