CVE-2026-52684
Prefetch Feature Allows Persistent Ghost Domain Cache Poisoning Attack
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | powerdns |
| Product | recursor |
| Published | Jul 23, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
PowerDNS / Recursor
0.0.0 < 5.5.0
Credits
Taofei Guo, Peking University. Qi Wang and JianJun Chen and Haixin Duan, Tsinghua University.