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PatchSiren cyber security CVE debrief

CVE-2026-33610 PowerDNS CVE debrief

A PowerDNS secondary server may experience file descriptor exhaustion and a denial of service when forwarding a DNS update request to a rogue primary server. Defenders should assess exposure, particularly those managing DNS infrastructure, and prioritize verification of affected versions and remediation. The impact is a potential denial of service, and the priority is to verify versions and apply patches.

Vendor
PowerDNS
Product
Authoritative
CVSS
MEDIUM 5.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-22
Original CVE updated
2026-10-26
Advisory published
2026-04-22
Advisory updated
2026-10-26

Who should care

Defenders managing DNS infrastructure, particularly those using PowerDNS Authoritative, should assess exposure and prioritize verification of affected versions and remediation.

Why it matters

CVE-2026-33610 is a medium-severity vulnerability in PowerDNS Authoritative that can lead to a denial of service. Defenders should assess exposure, verify affected versions, and prioritize remediation to prevent potential service disruption.

  • Potential denial of service impacting DNS service availability
  • Need to verify affected PowerDNS Authoritative versions
  • Priority to apply patches or updates to prevent exploitation

Technical summary

A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it. The vulnerability affects PowerDNS Authoritative versions 4.9.0 to 4.9.14 and 5.0.0 to 5.0.4.

Defensive priority

Verify affected PowerDNS Authoritative versions and apply patches

Recommended defensive actions

  • Verify if PowerDNS Authoritative versions 4.9.0 to 4.9.14 or 5.0.0 to 5.0.4 are in use
  • Apply patches or updates to affected versions
  • Monitor DNS infrastructure for potential denial of service
  • Review and update incident response plans for DNS-related incidents

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including a CVSS score of 5.9 and a description of the issue. A vendor advisory is available but the link is broken.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-33610 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-33610

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-33610 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-33610

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-powerdns-2026-05.html

    [email protected] - Broken Link, Vendor Advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.