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CVE-2026-6665

Estado: AnalizadaCrítica (9.8)—

The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend that sends a SCRAM server-final-message with a long nonce can trigger a stack overflow.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Red sin privilegios (AV:N/PR:N) permite explotación de aplicación expuesta (T1190). Stack overflow remoto resulta en ejecución arbitraria de código (T1059) en PgBouncer.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Pgbouncer — Pgbouncer

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-6665",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-6665",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-11T00:00:00+00:00"
        }
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          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
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  "published": "2026-05-09T01:16:09.013",
  "references": [
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      "url": "https://www.pgbouncer.org/changelog.html#pgbouncer-125x",
      "tags": [
        "Release Notes"
      ],
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007",
      "description": [
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          "lang": "en",
          "value": "CWE-121"
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      "lang": "en",
      "value": "The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend that sends a SCRAM server-final-message with a long nonce can trigger a stack overflow."
    },
    {
      "lang": "es",
      "value": "El código SCRAM en PgBouncer anterior a la versión 1.25.2 no verificaba correctamente el valor de retorno de strlcat() al construir el contenido del mensaje final del cliente SCRAM. Un backend malicioso que envía un mensaje final del servidor SCRAM con un nonce largo puede desencadenar un desbordamiento de pila."
    }
  ],
  "lastModified": "2026-07-24T08:10:00.150",
  "configurations": [
    {
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              "versionEndExcluding": "1.25.2"
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          "operator": "OR"
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  "sourceIdentifier": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007"
}