What’s Vulnerable › Vulnerabilities
CVE-2026-52684: Prefetch Feature Allows Persistent Ghost Domain Cache Poisoning Attack
- Severity: low (CVSS 3.7 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-23 · updated 2026-10-24
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.
Affected products
- PowerDNS Recursor: before 5.5.0 — fixed in 5.5.0
How to fix
Upgrade to a fixed version: PowerDNS Recursor 5.5.0. Check the vendor advisory for mitigations.
References
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