Missing support for integrity check in PowerDNS Recursor - CVE-2026-33261

 

Missing support for integrity check in PowerDNS Recursor - CVE-2026-33261

Published: April 22, 2026


Vulnerability identifier: #VU126850
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-33261
CWE-ID: CWE-353
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: PowerDNS.COM B.V.
Affected software:
PowerDNS Recursor

Detailed vulnerability description

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to internal inconsistency in aggressive NSEC(3) cache when a zone transitions from NSEC to NSEC3. A remote attacker can trigger a zone transition from NSEC to NSEC3 to cause a denial of service.


How to mitigate CVE-2026-33261

Install security update from vendor's website.

Sources