DNS Refresh Vulnerability in PowerDNS by PowerDNS
CVE-2026-52684

3.7LOW

Key Information:

Vendor

Powerdns

Status
Recursor
Vendor
CVE Published:
23 July 2026

What is CVE-2026-52684?

A vulnerability exists in PowerDNS where slow authentication responses can lead to issues with Time-To-Live (TTL) enforcement. Specifically, if the authentication responds slowly and the records near expiration are used for refreshing authoritative Name Server (NS) records, the lack of data prevents the capping of TTLs. This situation allows for almost expired records to be improperly utilized, compromising the integrity of DNS resolution for legitimate queries. Regular resolution processes do not encounter this issue as they utilize valid child records directly or discard expired ones.

Affected Version(s)

Recursor 0.0.0 < 5.5.0

References

https://github.com/PowerDNS/pdns/pull/17748

CVSS V3.1

Score:
3.7
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Taofei Guo, Peking University. Qi Wang and JianJun Chen and Haixin Duan, Tsinghua University.
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