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CVE-2026-42005

Status: DeferredMedium (4.3)—

An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-42005",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-42005",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-25T13:03:44.259390Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security@open-xchange.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@open-xchange.com",
      "affectedData": [
        {
          "repo": "https://github.com/PowerDNS/pdns",
          "vendor": "PowerDNS",
          "modules": [
            "YaHTTP"
          ],
          "product": "Authoritative",
          "versions": [
            {
              "status": "affected",
              "version": "4.9.0",
              "lessThan": "4.9.16",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.0.0",
              "lessThan": "5.0.6",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.1.0",
              "lessThan": "5.1.2",
              "versionType": "semver"
            }
          ],
          "packageName": "pdns",
          "programFiles": [
            "ext/yahttp/yahttp/reqresp.cpp"
          ],
          "collectionURL": "https://repo.powerdns.com/",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-06-25T12:16:47.350",
  "references": [
    {
      "url": "https://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-powerdns-2026-07.html",
      "source": "security@open-xchange.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An attacker can send a web request that causes unlimited memory \nallocation in the internal web server, leading to a denial of service. \nThe internal web server is disabled by default."
    }
  ],
  "lastModified": "2026-06-25T16:00:30.783",
  "sourceIdentifier": "security@open-xchange.com"
}