CVE-2026-33611 Insufficient validation of HTTPS and SVCB records

Medium 6.5 Published 22 Apr 2026 Updated 22 Apr 2026

An authenticated operator can corrupt the LMDB database via invalid HTTPS/SVCB records, causing denial of service in PowerDNS Authoritative.

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

What is CVE-2026-33611?

CVE-2026-33611 is a medium-severity vulnerability in PowerDNS Authoritative, published on 22 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

An operator allowed to use the REST API can cause the Authoritative server to produce invalid HTTPS or SVCB record data, which can in turn cause LMDB database corruption, if using the LMDB backend.

Weakness: CWE-190

Which versions are affected by CVE-2026-33611?

It affects 1 product.

Products include Powerdns Authoritative.

How do I fix CVE-2026-33611?

Apply the vendor's patch.

Is CVE-2026-33611 being exploited?

There is no known exploitation of CVE-2026-33611 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2026-33611, GHSA-vqqc-7rwf-3j3j, UBUNTU-CVE-2026-33611.