CVE-2026-52684 Details
Description
If the auth responds very slowly and the records expire in between, the capping of TTLs is not enforced for lack of data. This does not happen on regular resolve as then then the child records are used immediately if not expired and thus valid, or the records are expired, and in that case not used. So this case can only happen if almost expired records are used to refresh the authoritative NS records.
A vulnerability exists in PowerDNS when refreshing authoritative name server (NS) records. If the authentication response is slow and the time-to-live (TTL) of records expires in the meantime, the system fails to enforce TTL limits due to insufficient data. This issue does not occur during regular resolution, as child records are immediately utilized if valid or expired records are not used at all. The vulnerability arises only when nearly expired records are improperly used to refresh NS records.
Users can update to the latest version of PowerDNS, where this issue has been addressed, to mitigate this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 23, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/PowerDNS/pdns/pull/17748 | [email protected] |
Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
No affected product data is available for this CVE.
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Modified | CISA-ADP |
| Jul 23, 2026 | New CVE Received | [email protected] |