PYSEC-2026-1438

Vulnerability from pysec - Published: 2026-07-07 14:34 - Updated: 2026-07-07 17:24
VLAI
Details

A vulnerability in the typeahead endpoint of h2oai/h2o-3 version 3.46.0 allows for a denial of service. The endpoint performs a HEAD request to verify the existence of a specified resource without setting a timeout. An attacker can exploit this by sending multiple requests to an attacker-controlled server that hangs, causing the application to block and become unresponsive to other requests.

Severity
7.5 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impacted products
Name purl
h2o pkg:pypi/h2o
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "h2o",
        "purl": "pkg:pypi/h2o"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.2.0.1"
            },
            {
              "last_affected": "3.46.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.10.0.10",
        "3.10.0.3",
        "3.10.0.6",
        "3.10.0.7",
        "3.10.0.8",
        "3.10.3.3",
        "3.10.3.4",
        "3.10.4.1",
        "3.10.4.2",
        "3.10.4.3",
        "3.10.4.4",
        "3.10.4.6",
        "3.10.4.8",
        "3.16.0.1",
        "3.16.0.2",
        "3.16.0.3",
        "3.16.0.4",
        "3.18.0.1",
        "3.18.0.10",
        "3.18.0.11",
        "3.18.0.2",
        "3.18.0.3",
        "3.18.0.4",
        "3.18.0.5",
        "3.18.0.6",
        "3.18.0.7",
        "3.18.0.8",
        "3.18.0.9",
        "3.20.0.4",
        "3.20.0.5",
        "3.20.0.6",
        "3.20.0.7",
        "3.20.0.8",
        "3.22.0.1",
        "3.22.0.2",
        "3.22.0.3",
        "3.22.0.4",
        "3.22.0.5",
        "3.22.1.1",
        "3.22.1.2",
        "3.22.1.3",
        "3.22.1.4",
        "3.22.1.5",
        "3.22.1.6",
        "3.24.0.1",
        "3.24.0.2",
        "3.24.0.3",
        "3.24.0.4",
        "3.24.0.5",
        "3.26.0.1",
        "3.26.0.10",
        "3.26.0.11",
        "3.26.0.2",
        "3.26.0.3",
        "3.26.0.4",
        "3.26.0.5",
        "3.26.0.6",
        "3.26.0.8",
        "3.26.0.9",
        "3.28.0.1",
        "3.28.0.2",
        "3.28.0.3",
        "3.28.1.2",
        "3.28.1.3",
        "3.30.0.1",
        "3.30.0.2",
        "3.30.0.3",
        "3.30.0.4",
        "3.30.0.5",
        "3.30.0.6",
        "3.30.0.7",
        "3.30.1.1",
        "3.30.1.2",
        "3.30.1.3",
        "3.32.0.2",
        "3.32.0.3",
        "3.32.0.4",
        "3.32.0.5",
        "3.32.1.1",
        "3.32.1.2",
        "3.32.1.3",
        "3.32.1.4",
        "3.32.1.5",
        "3.32.1.6",
        "3.32.1.7",
        "3.34.0.3",
        "3.34.0.7",
        "3.34.0.8",
        "3.36.0.2",
        "3.36.0.3",
        "3.36.0.4",
        "3.36.1.1",
        "3.36.1.2",
        "3.36.1.3",
        "3.36.1.4",
        "3.36.1.5",
        "3.38.0.1",
        "3.38.0.2",
        "3.38.0.3",
        "3.38.0.4",
        "3.40.0.1",
        "3.40.0.2",
        "3.40.0.3",
        "3.40.0.4",
        "3.42.0.1",
        "3.42.0.2",
        "3.42.0.3",
        "3.42.0.4",
        "3.44.0.1",
        "3.44.0.2",
        "3.44.0.3"
      ]
    }
  ],
  "aliases": [
    "CVE-2024-8062",
    "GHSA-5c8j-g96x-cj78"
  ],
  "details": "A vulnerability in the typeahead endpoint of h2oai/h2o-3 version 3.46.0 allows for a denial of service. The endpoint performs a `HEAD` request to verify the existence of a specified resource without setting a timeout. An attacker can exploit this by sending multiple requests to an attacker-controlled server that hangs, causing the application to block and become unresponsive to other requests.",
  "id": "PYSEC-2026-1438",
  "modified": "2026-07-07T17:24:17.447012Z",
  "published": "2026-07-07T14:34:56.262232Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-8062"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/h2oai/h2o-3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/h2oai/h2o-3/blob/047a4d617240a56e74f834207c65973d133391cb/h2o-core/src/main/java/water/persist/PersistManager.java#L302"
    },
    {
      "type": "WEB",
      "url": "https://huntr.com/bounties/a04190d9-4acb-449a-9a7f-f1bf6be1ed23"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/h2o"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-5c8j-g96x-cj78"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "H2O Vulnerable to Denial of Service (DoS) via `HEAD` Request"
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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