CVE-2026-33610 Possible file descriptor exhaustion in forward-dnsupdate

Medium 5.9 Published 22 Apr 2026 Updated 22 Apr 2026

A rogue primary server can cause file descriptor exhaustion and denial of service in PowerDNS Authoritative when forwarding DNS updates.

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

What is CVE-2026-33610?

CVE-2026-33610 is a medium-severity denial of service 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

A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it.

Weakness: CWE-400

Which versions are affected by CVE-2026-33610?

It affects 1 product.

Products include Powerdns Authoritative.

How do I fix CVE-2026-33610?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-33610 being exploited?

There is no known exploitation of CVE-2026-33610 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2026-33610, GHSA-7rv6-r2fm-295c, UBUNTU-CVE-2026-33610.