CVE-2026-33600 Null pointer dereference in RPZ transfer
A malicious authoritative server can cause a denial of service in PowerDNS Recursor via a null pointer dereference during RPZ transfer.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33600?
CVE-2026-33600 is a medium-severity vulnerability in Powerdns Recursor, published on 22 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.
Weakness: CWE-476
Which versions are affected by CVE-2026-33600?
It affects 1 product.
Products include Powerdns Recursor.
How do I fix CVE-2026-33600?
Apply the vendor's patch.
Is CVE-2026-33600 being exploited?
There is no known exploitation of CVE-2026-33600 in the wild and no public exploit code.
Other vulnerabilities in Powerdns Recursor
- CVE-2009-4009 Memory corruption in n/a
- CVE-2020-10030 Memory corruption in n/a
- CVE-2025-59023 Crafted delegations or IP fragments can poison cached delegations in Recursor
- CVE-2025-59030 Insufficient validation of incoming notifies over TCP can lead to a denial of service in Recursor
- CVE-2023-22617 Denial of service in n/a
Sources
Also known as DEBIAN-CVE-2026-33600, GHSA-m52j-g834-6q2q, UBUNTU-CVE-2026-33600.