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CVE-2026-40014

Estado: AplazadaMedia (6.5)—

An attacker that can send mail to a user can craft a message header that makes the IMAP THREAD command consume CPU disproportionate to the size of the message. When a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for IMAP. Monitor system for abnormal CPU usage, kill the offending process and remove the offending message from the affected mailbox. Update to non-vulnerable version. No publicly available exploits are known.

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)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Imap — ImapAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-40014",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40014",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-28T14:32:39.280100Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security@open-xchange.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@open-xchange.com",
      "affectedData": [
        {
          "vendor": "Open-Xchange GmbH",
          "modules": [
            "core"
          ],
          "product": "OX Dovecot Pro",
          "versions": [
            {
              "status": "affected",
              "version": "2.3.0",
              "lessThan": "2.3.22.2",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "3.0.0",
              "lessThan": "3.0.7",
              "versionType": "semver"
            },
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              "status": "affected",
              "version": "3.1.0",
              "lessThan": "3.1.6",
              "versionType": "semver"
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        {
          "vendor": "Open-Xchange GmbH",
          "modules": [
            "core"
          ],
          "product": "OX Dovecot CE",
          "versions": [
            {
              "status": "affected",
              "version": "2.3.0",
              "lessThan": "2.4.5",
              "versionType": "semver"
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          "defaultStatus": "unaffected"
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  ],
  "published": "2026-08-28T12:16:28.240",
  "references": [
    {
      "url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json",
      "source": "security@open-xchange.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@open-xchange.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An attacker that can send mail to a user can craft a message header that makes the IMAP THREAD command consume CPU disproportionate to the size of the message. When a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for IMAP. Monitor system for abnormal CPU usage, kill the offending process and remove the offending message from the affected mailbox. Update to non-vulnerable version. No publicly available exploits are known."
    }
  ],
  "lastModified": "2026-09-03T18:13:44.643",
  "sourceIdentifier": "security@open-xchange.com"
}