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PatchSiren cyber security CVE debrief

CVE-2026-52690 PowerDNS CVE debrief

A vulnerability in Powerdns Recursor may cause incorrect marking of an authoritative server's IP as not supporting EDNS, leading to failed validation of DNSSEC records served by that server. This issue arises from spoofing replies to Recursor, which might impact DNS infrastructure, particularly those using Powerdns Recursor. Defenders should assess exposure and verify EDNS support of authoritative servers. The CVE record and NVD entry provide limited information about the vulnerability, and further investigation is required to determine the affected versions and potential impact.

Vendor
PowerDNS
Product
Recursor
CVSS
MEDIUM 5.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-25
Original CVE updated
2026-10-25
Advisory published
2026-06-25
Advisory updated
2026-10-25

Who should care

Defenders responsible for DNS infrastructure, particularly those using Powerdns Recursor, should assess exposure and verify EDNS support of authoritative servers.

Why it matters

Defenders should prioritize verifying EDNS support of authoritative servers and ensuring proper configuration of Powerdns Recursor to prevent DNSSEC validation failures. This vulnerability may impact DNS infrastructure, particularly those using Powerdns Recursor.

  • Potential DNSSEC validation failures
  • Incorrect marking of authoritative server IP as not supporting EDNS
  • Spoofing replies to Recursor may cause validation issues

Technical summary

The Powerdns Recursor is vulnerable to spoofing replies, which may cause incorrect marking of an authoritative server's IP as not supporting EDNS. This leads to failed validation of DNSSEC records served by that server. The vulnerability affects Powerdns Recursor and may impact DNS infrastructure. Defenders should prioritize verifying the EDNS support of authoritative servers and ensuring proper configuration of Powerdns Recursor to prevent DNSSEC validation failures.

Defensive priority

Defenders should prioritize verifying the EDNS support of authoritative servers and ensuring proper configuration of Powerdns Recursor to prevent DNSSEC validation failures.

Recommended defensive actions

  • Verify EDNS support of authoritative servers
  • Ensure proper configuration of Powerdns Recursor
  • Monitor DNSSEC validation failures

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further investigation is required to determine the affected versions and potential impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-52690 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-52690

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

  • CVE-2026-52690 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-52690

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

Supplemental references

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.