« Volver al listado

CVE-2026-59739

Estado: AnalizadaAlta (7.5)—

Information disclosure via SetWatches reconnect replay in Apache ZooKeeper due to missing ACL check. An attacker can discover ACL-restricted paths by registering exists-watches on non-existent paths, then reconnecting after the paths are created with restricted ACLs. Issue is caused by incomplete fix for CVE-2024-23944 (ZOOKEEPER-4799). The fix added ACL checking to WatchManager.triggerWatch(). However, DataTree.setWatches() — the SetWatches/SetWatches2 reconnect replay handler — still calls watcher.process(event) with null ACL, bypassing the check entirely.

Leer descripción completaMostrar menos

It's important to note that only the path is exposed by this vulnerability, not the data of znode, but since znode path can contain sensitive information like user name or login ID, this issue is potentially critical.

Users are recommended to upgrade to version 3.9.6, 3.8.7 which fixes the issue.

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.

Vulnerabilidad de divulgación de información en ZooKeeper accesible por red sin autenticación (AV:N, PR:N, UI:N). El atacante descubre rutas ACL-restringidas mediante watches, exponiendo información sensible en nombres de ruta (usuarios, IDs de login).

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

Privileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkVulnerability ScanningUser Account ManagementFilter Network Traffic

Tecnologías afectadas (1)

Apache — Zookeeper

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-59739",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-59739",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-17T19:17:33.790349Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@apache.org",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache ZooKeeper",
          "versions": [
            {
              "status": "affected",
              "version": "3.9.0",
              "versionType": "maven",
              "lessThanOrEqual": "3.9.5"
            },
            {
              "status": "affected",
              "version": "3.8.0",
              "versionType": "semver",
              "lessThanOrEqual": "3.8.6"
            }
          ],
          "packageURL": "pkg:maven/org.apache.zookeeper/zookeeper",
          "packageName": "org.apache.zookeeper:zookeeper",
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-09-16T10:16:51.097",
  "references": [
    {
      "url": "https://lists.apache.org/thread/v0lrwsbdxvx6w67p3z7fxf3hzyncq55l",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ],
      "source": "security@apache.org"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@apache.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Information disclosure via SetWatches reconnect replay in Apache ZooKeeper due to missing ACL check. An attacker can discover ACL-restricted paths by registering exists-watches on non-existent paths, then reconnecting after the paths are created with restricted ACLs. Issue is caused by incomplete fix for CVE-2024-23944 (ZOOKEEPER-4799). The fix added ACL checking to WatchManager.triggerWatch(). However, DataTree.setWatches() — the SetWatches/SetWatches2 reconnect replay handler — still calls watcher.process(event) with null ACL, bypassing the check entirely. It's important to note that only the path is exposed by this vulnerability, not the data of znode, but since znode path can contain sensitive information like user name or login ID, this issue is potentially critical.\n\nUsers are recommended to upgrade to version 3.9.6, 3.8.7 which fixes the issue."
    }
  ],
  "lastModified": "2026-09-18T14:37:10.223",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:apache:zookeeper:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4EB0BE5E-6F39-4D77-BBEC-89AE61429E31",
              "versionEndExcluding": "3.8.7",
              "versionStartIncluding": "3.8.0"
            },
            {
              "criteria": "cpe:2.3:a:apache:zookeeper:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "78E0C560-E216-4628-9131-E8C919D8B937",
              "versionEndExcluding": "3.9.6",
              "versionStartIncluding": "3.9.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@apache.org"
}