CVE-2026-102664 (GCVE-0-2026-102664)

Vulnerability from cvelistv5 – Published: 2026-11-04 20:42 – Updated: 2026-11-09 16:58
VLAI
Title
ProxySQL: Uninitialized heap read in MySQL compressed packet decompression via zlib path
Summary
ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL. Prior to 3.0.10, 3.1.10, and 4.0.10, decompress_mysql_payload() in lib/mysql_data_stream.cpp accepts a zlib stream when uncompress() returns Z_OK without checking that the actual output length equals the attacker-controlled payload_length. An authenticated MySQL client that negotiates compression can overstate payload_length, causing buffer2array() to parse the uninitialized tail of a heap buffer as MySQL packet headers and forward stale data to the backend. Backend error responses can disclose prior SQL queries, result data, credentials, or session state, and malformed lengths can also cause excessive allocations. This issue is fixed in versions 3.0.10, 3.1.10, and 4.0.10.
Severity
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 16:09 UTC
CWE
  • CWE-908 - Use of Uninitialized Resource
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
sysown proxysql Affected: < 3.0.10
Affected: >= 3.1.0, < 3.1.10
Affected: >= 4.0.0, < 4.0.10
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-102664",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-09T16:09:27.461578Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-11-09T16:58:32.215Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "proxysql",
          "vendor": "sysown",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.0.10"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.1.0, \u003c 3.1.10"
            },
            {
              "status": "affected",
              "version": "\u003e= 4.0.0, \u003c 4.0.10"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL. Prior to 3.0.10, 3.1.10, and 4.0.10, decompress_mysql_payload() in lib/mysql_data_stream.cpp accepts a zlib stream when uncompress() returns Z_OK without checking that the actual output length equals the attacker-controlled payload_length. An authenticated MySQL client that negotiates compression can overstate payload_length, causing buffer2array() to parse the uninitialized tail of a heap buffer as MySQL packet headers and forward stale data to the backend. Backend error responses can disclose prior SQL queries, result data, credentials, or session state, and malformed lengths can also cause excessive allocations. This issue is fixed in versions 3.0.10, 3.1.10, and 4.0.10."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-908",
              "description": "CWE-908: Use of Uninitialized Resource",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-04T20:42:25.887Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/sysown/proxysql/security/advisories/GHSA-fvch-fpgq-pwfx",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/sysown/proxysql/security/advisories/GHSA-fvch-fpgq-pwfx"
        },
        {
          "name": "https://github.com/sysown/proxysql/commit/396c742f7d50b1f479e1157e296ee9d0aff1b724",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sysown/proxysql/commit/396c742f7d50b1f479e1157e296ee9d0aff1b724"
        },
        {
          "name": "https://github.com/sysown/proxysql/commit/a8c1cef4d44c4beea7f6aa21b8a09a7cb8c75520",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sysown/proxysql/commit/a8c1cef4d44c4beea7f6aa21b8a09a7cb8c75520"
        },
        {
          "name": "https://github.com/sysown/proxysql/releases/tag/v3.0.10",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sysown/proxysql/releases/tag/v3.0.10"
        },
        {
          "name": "https://github.com/sysown/proxysql/releases/tag/v3.1.10",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sysown/proxysql/releases/tag/v3.1.10"
        },
        {
          "name": "https://github.com/sysown/proxysql/releases/tag/v4.0.10",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sysown/proxysql/releases/tag/v4.0.10"
        }
      ],
      "source": {
        "advisory": "GHSA-fvch-fpgq-pwfx",
        "discovery": "UNKNOWN"
      },
      "title": "ProxySQL: Uninitialized heap read in MySQL compressed packet decompression via zlib path"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-102664",
    "datePublished": "2026-11-04T20:42:25.887Z",
    "dateReserved": "2026-09-29T15:56:02.102Z",
    "dateUpdated": "2026-11-09T16:58:32.215Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.