CVE-2026-52684: Time-of-check Time-of-use (TOCTOU) Race Condition in PowerDNS Recursor
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.
CVE-2026-52684: Time-of-check Time-of-use (TOCTOU) Race Condition in PowerDNS Recursor
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.
CVSS v3.1
Score 3.7low
Affected software
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Technical Details
- Data Version
- 5.2
- Assigner Short Name
- OX
- Date Reserved
- 2026-06-08T08:05:31.707Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a61d2cf9c2644c7f8b6a265
Added to database: 07/23/2026, 08:37:35 UTC
Last updated: 07/23/2026, 08:37:35 UTC
Views: 1
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