CVE-2026-33258: Powerdns Recursor

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.

Affected products

• Powerdns Recursor: from 5.2.0, before 5.2.9 (fixed in 5.2.9); from 5.3.0, before 5.3.6 (fixed in 5.3.6); version 5.4.0 only

Published 2026-04-22. Last modified 2026-06-17.