GHSA-797X-P4MC-JWPM

Vulnerability from github – Published: 2026-10-30 23:00 – Updated: 2026-10-30 23:00
VLAI
Summary
MariaDB Connector/J: Length-encoded integers larger than Integer.MAX_VALUE were truncated before being used as lengths
Details

Summary

MariaDB Connector/J narrowed 8-byte length-encoded integers received from the server to int without validation. A rogue or MitM server can send a value above Integer.MAX_VALUE whose truncation becomes a negative or arbitrary length.

Details

The protocol encodes lengths as length-encoded integers, whose 8-byte form the decoder (readLength() and readIntLengthEncodedNotNull()) returned as (int) readLong(). A value above Integer.MAX_VALUE therefore wrapped to a negative or unrelated int, used afterwards as a length to size allocations or reads, which ended in NegativeArraySizeException, out-of-bounds exceptions or oversized allocations.

The fix rejects any length-encoded value that does not fit a non-negative int with an explicit error.

Impact

Availability only: a malicious or compromised server, or a MitM, can crash the client's connection handling with unchecked exceptions or drive oversized allocations. Exploitation requires control of the server side of the connection; no authentication bypass, confidentiality or integrity impact.

Credit

Reported by fg0x0

Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.mariadb.jdbc:mariadb-java-client"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.3.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.mariadb.jdbc:mariadb-java-client"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.4.0"
            },
            {
              "fixed": "3.4.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.mariadb.jdbc:mariadb-java-client"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.5.0"
            },
            {
              "fixed": "3.5.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-119279"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-130",
      "CWE-190"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-30T23:00:07Z",
    "nvd_published_at": "2026-10-29T21:17:21Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nMariaDB Connector/J narrowed 8-byte length-encoded integers received from the\nserver to `int` without validation. A rogue or MitM server can send a value above\n`Integer.MAX_VALUE` whose truncation becomes a negative or arbitrary length.\n\n## Details\n\nThe protocol encodes lengths as length-encoded integers, whose 8-byte form the\ndecoder (`readLength()` and `readIntLengthEncodedNotNull()`) returned as\n`(int) readLong()`. A value above `Integer.MAX_VALUE` therefore wrapped to a\nnegative or unrelated `int`, used afterwards as a length to size allocations or\nreads, which ended in `NegativeArraySizeException`, out-of-bounds exceptions or\noversized allocations.\n\nThe fix rejects any length-encoded value that does not fit a non-negative `int`\nwith an explicit error.\n\n## Impact\n\nAvailability only: a malicious or compromised server, or a MitM, can crash the\nclient\u0027s connection handling with unchecked exceptions or drive oversized\nallocations. Exploitation requires control of the server side of the connection;\nno authentication bypass, confidentiality or integrity impact.\n\n## Credit\n\nReported by fg0x0",
  "id": "GHSA-797x-p4mc-jwpm",
  "modified": "2026-10-30T23:00:07Z",
  "published": "2026-10-30T23:00:07Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-797x-p4mc-jwpm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119279"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-j/commit/30d4a883377a9b7762e02ee2c60d54567032ab99"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-j/commit/bfd9f5ad666a6f7f5401a5b78f2ac2fbd6df8667"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-j/commit/dbbadc3e215c47bdb913ddf50739ada09a7f23ea"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-j"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.3.7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.10"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "MariaDB Connector/J: Length-encoded integers larger than Integer.MAX_VALUE were truncated before being used as lengths"
}



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