CVE-2026-44161

{
  "id": "CVE-2026-44161",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-08T22:17:14.737",
  "lastModified": "2026-10-25T17:10:00.197",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop and so on. Prior to 1.19.3, the Fluentd out_http output plugin allows placeholders such as ${tag} in the endpoint configuration parameter, and if a placeholder value is derived from untrusted input an attacker can control the destination hostname of outbound HTTP requests and force requests to arbitrary internal services. This issue is fixed in version 1.19.3."
    },
    {
      "lang": "es",
      "value": "Fluentd recopila eventos de varias fuentes de datos y los escribe en archivos, RDBMS, NoSQL, IaaS, SaaS, Hadoop, etc. Antes de la versión 1.19.3, el plugin de salida out_http de Fluentd permite marcadores de posición como ${tag} en el parámetro de configuración del endpoint, y si un valor de marcador de posición se deriva de una entrada no confiable, un atacante puede controlar el nombre de host de destino de las solicitudes HTTP salientes y forzar solicitudes a servicios internos arbitrarios. Este problema está corregido en la versión 1.19.3."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "fluent",
          "product": "fluentd",
          "versions": [
            {
              "version": "< 1.19.3",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L",
          "baseScore": 7.2,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.7
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-09T14:37:57.811738Z",
          "id": "CVE-2026-44161",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:fluentd:fluentd:*:*:*:*:*:*:*:*",
              "versionEndExcluding": "1.19.3",
              "matchCriteriaId": "7AB3C52C-7D3D-4BA5-A8D0-8AC7DA6030EC"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/fluent/fluentd/commit/c6a01ea2e0ea01977f8d615f7c6dbfae4cba88c9",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/fluent/fluentd/pull/5394",
      "source": "[email protected]",
      "tags": [
        "Issue Tracking",
        "Patch"
      ]
    },
    {
      "url": "https://github.com/fluent/fluentd/releases/tag/v1.19.3",
      "source": "[email protected]",
      "tags": [
        "Product",
        "Release Notes"
      ]
    },
    {
      "url": "https://github.com/fluent/fluentd/security/advisories/GHSA-72f5-rr8c-r6gr",
      "source": "[email protected]",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ]
    }
  ]
}