PYSEC-2026-1445

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

A vulnerability in the /3/Parse endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint uses a user-specified string to construct a regular expression, which is then applied to another user-specified string. By sending multiple simultaneous requests, an attacker can exhaust all available threads, leading to a complete denial of service.

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": "3.30.0.7"
            },
            {
              "last_affected": "3.46.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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",
        "3.46.0.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2024-10549",
    "GHSA-wwr9-4gmr-xvq9"
  ],
  "details": "A vulnerability in the `/3/Parse` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint uses a user-specified string to construct a regular expression, which is then applied to another user-specified string. By sending multiple simultaneous requests, an attacker can exhaust all available threads, leading to a complete denial of service.",
  "id": "PYSEC-2026-1445",
  "modified": "2026-07-07T17:24:17.852578Z",
  "published": "2026-07-07T14:34:51.332109Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-10549"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/h2oai/h2o-3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/h2oai/h2o-3/blob/51c25940ded8b7d0acc8f3f72329fd9dedbb3a34/h2o-core/src/main/java/water/api/ParseHandler.java#L80"
    },
    {
      "type": "WEB",
      "url": "https://huntr.com/bounties/ce7bd2d6-fd38-440d-a91a-dd8f3fc06bc2"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/h2o"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-wwr9-4gmr-xvq9"
    }
  ],
  "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 `/3/Parse` Endpoint"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.


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