CVE-2026-33608 Incomplete domain name sanitization during

High 7.4 Published 22 Apr 2026 Updated 22 Apr 2026

An attacker can inject invalid configuration via notify requests, causing the PowerDNS backend to fail on restart and requiring manual intervention.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-33608?

CVE-2026-33608 is a high-severity code injection vulnerability in PowerDNS Authoritative, published on 22 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An attacker can send a notify request that causes a new secondary domain to be added to the bind backend, but causes said backend to update its configuration to an invalid one, leading to the backend no longer able to run on the next restart, requiring manual operation to fix it.

Weakness: CWE-94

Which versions are affected by CVE-2026-33608?

It affects 1 product.

Products include Powerdns Authoritative.

How do I fix CVE-2026-33608?

Apply the vendor's patch.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-33608 being exploited?

There is no known exploitation of CVE-2026-33608 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2026-33608, GHSA-q6jm-wh7h-j4g3, UBUNTU-CVE-2026-33608.