PYSEC-2026-2180

Vulnerability from pysec - Published: 2026-04-23 10:16 - Updated: 2026-07-13 05:49
VLAI
Details

A critical remote code execution vulnerability exists in the unauthenticated REST API endpoint /99/ImportSQLTable in H2O-3 version 3.46.0.9 and prior. The vulnerability arises due to insufficient security controls in the parameter blacklist mechanism, which only targets MySQL JDBC driver-specific dangerous parameters. An attacker can bypass these controls by switching the JDBC URL protocol to jdbc:postgresql: and exploiting PostgreSQL JDBC driver-specific parameters such as socketFactory and socketFactoryArg. This allows unauthenticated attackers to execute arbitrary code on the H2O-3 server with the privileges of the H2O-3 process. The issue is resolved in version 3.46.0.10.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impacted products
Name purl
h2o pkg:pypi/h2o
Aliases
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "h2o",
        "purl": "pkg:pypi/h2o"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.46.0.10"
            }
          ],
          "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",
        "3.46.0.1",
        "3.46.0.2",
        "3.46.0.3",
        "3.46.0.4",
        "3.46.0.5",
        "3.46.0.6",
        "3.46.0.7",
        "3.46.0.8",
        "3.46.0.9"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-3960"
  ],
  "details": "A critical remote code execution vulnerability exists in the unauthenticated REST API endpoint /99/ImportSQLTable in H2O-3 version 3.46.0.9 and prior. The vulnerability arises due to insufficient security controls in the parameter blacklist mechanism, which only targets MySQL JDBC driver-specific dangerous parameters. An attacker can bypass these controls by switching the JDBC URL protocol to jdbc:postgresql: and exploiting PostgreSQL JDBC driver-specific parameters such as socketFactory and socketFactoryArg. This allows unauthenticated attackers to execute arbitrary code on the H2O-3 server with the privileges of the H2O-3 process. The issue is resolved in version 3.46.0.10.",
  "id": "PYSEC-2026-2180",
  "modified": "2026-07-13T05:49:05.335112Z",
  "published": "2026-04-23T10:16:17.813Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044"
    },
    {
      "type": "EVIDENCE",
      "url": "https://huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0d"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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