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CVE-2026-40209 Denial of service via IXFR queries

🗓️ 25 Jun 2026 12:23:05Reported by OXType 
cvelist
 cvelist
🔗 www.cve.org👁 4 Views

CVE-2026-40209 DoS via incremental zone transfer queries causing backend connections to hang until timeout and exhaust file descriptors.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-40209
25 Jun 202612:23
attackerkb
CVE
CVE-2026-40209
25 Jun 202612:23
cve
Debian CVE
CVE-2026-40209
25 Jun 202612:23
debiancve
EUVD
EUVD-2026-39348
25 Jun 202612:23
euvd
NVD
CVE-2026-40209
25 Jun 202613:16
nvd
Positive Technologies
PT-2026-52381
25 Jun 202600:00
ptsecurity
Vulnrichment
CVE-2026-40209 Denial of service via IXFR queries
25 Jun 202612:23
vulnrichment
[
  {
    "vendor": "PowerDNS",
    "product": "DNSdist",
    "collectionURL": "https://repo.powerdns.com/",
    "packageName": "dnsdist",
    "repo": "https://github.com/PowerDNS/pdns",
    "modules": [
      "DNS over TCP to the backend"
    ],
    "programFiles": [
      "dnsdist-tcp-downstream.cc"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "1.9.0",
        "lessThan": "1.9.15",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "2.0.0",
        "lessThan": "2.0.7",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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