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CVE-2026-44253

Estado: AnalizadaMedia (4.9)—

Wazuh is a free and open source platform used for threat prevention, detection, and response. From 3.9.0 until 4.14.5 and 5.0.0-beta2, the Wazuh cluster protocol in framework/wazuh/core/cluster/common.py allows an authenticated cluster node to exhaust memory on the master. The receive_str() method accepts an attacker-controlled total for InBuffer without a maximum, so a new_str command can request a multi-gigabyte bytearray and repeated requests accumulate in in_str. The divided-message path also retains flag_divided fragments under unique counters in div_msg_box without a count, aggregate-size, or expiration limit. Exploitation can disrupt agent connectivity and alert processing across the monitored environment. This issue is fixed in versions 4.14.5 and 5.0.0-beta2.

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).

Tecnologías afectadas (1)

Wazuh — Wazuh

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-44253",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-44253",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-25T02:13:22.111115Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.2
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "wazuh",
          "product": "wazuh",
          "versions": [
            {
              "status": "affected",
              "version": ">= 3.9.0, < 4.14.5"
            },
            {
              "status": "affected",
              "version": ">= 5.0.0-beta1, < 5.0.0-beta2"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-08-19T16:17:10.833",
  "references": [
    {
      "url": "https://github.com/wazuh/wazuh/commit/d29c5c89a0e16477545ca27f4e06229021e3183c",
      "tags": [
        "Patch"
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      "source": "security-advisories@github.com"
    },
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      "url": "https://github.com/wazuh/wazuh/pull/35173",
      "tags": [
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        "Patch"
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/wazuh/wazuh/releases/tag/v4.14.5",
      "tags": [
        "Patch",
        "Release Notes"
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        },
        {
          "lang": "en",
          "value": "CWE-789"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Wazuh is a free and open source platform used for threat prevention, detection, and response. From 3.9.0 until 4.14.5 and 5.0.0-beta2, the Wazuh cluster protocol in framework/wazuh/core/cluster/common.py allows an authenticated cluster node to exhaust memory on the master. The receive_str() method accepts an attacker-controlled total for InBuffer without a maximum, so a new_str command can request a multi-gigabyte bytearray and repeated requests accumulate in in_str. The divided-message path also retains flag_divided fragments under unique counters in div_msg_box without a count, aggregate-size, or expiration limit. Exploitation can disrupt agent connectivity and alert processing across the monitored environment. This issue is fixed in versions 4.14.5 and 5.0.0-beta2."
    }
  ],
  "lastModified": "2026-09-22T19:47:36.957",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "769B2796-8746-40EA-A39F-18EE80F9F15A",
              "versionEndExcluding": "4.14.5",
              "versionStartIncluding": "3.9.0"
            },
            {
              "criteria": "cpe:2.3:a:wazuh:wazuh:5.0.0:beta1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "007B01AA-AED0-4E92-8999-07E74B630460"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}