CVE-2026-27859

{
  "id": "CVE-2026-27859",
  "sourceIdentifier": "[email protected]",
  "published": "2026-03-27T09:16:20.223",
  "lastModified": "2026-10-26T00:10:00.150",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the processing is limited. No publicly available exploits are known."
    },
    {
      "lang": "es",
      "value": "Un mensaje de correo que contiene una cantidad excesiva de parámetros MIME RFC 2231 provoca que LMTP utilice demasiada CPU. Un mensaje de correo formateado adecuadamente provoca que el proceso de entrega de correo consuma grandes cantidades de tiempo de CPU. Utilice las capacidades del MTA para limitar los parámetros MIME RFC 2231 en los mensajes de correo, o actualice a una versión corregida donde el procesamiento está limitado. No se conocen exploits disponibles públicamente."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Open-Xchange GmbH",
          "product": "OX Dovecot Pro",
          "defaultStatus": "unaffected",
          "modules": [
            "core"
          ],
          "versions": [
            {
              "version": "0",
              "lessThanOrEqual": "3.0.2",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThanOrEqual": "3.1.0",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThanOrEqual": "2.4.0",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
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      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4
      }
    ],
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        "ssvcData": {
          "timestamp": "2026-03-27T12:34:31.543674Z",
          "id": "CVE-2026-27859",
          "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-400"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
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  "references": [
    {
      "url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json",
      "source": "[email protected]",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}