CVE-2026-33261: Powerdns Recursor

Medium severity, CVSS 5.9. EPSS: 0.2% chance of exploitation in the next 30 days.

A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service.

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.