CVE-2026-24029 DNS over HTTPS ACL bypass

Medium 6.5 Published 31 Mar 2026 Updated 31 Mar 2026

Attackers can bypass DNS over HTTPS access controls when early ACL dropping is disabled, allowing unauthorized clients to send queries.

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

What is CVE-2026-24029?

CVE-2026-24029 is a medium-severity authentication bypass vulnerability in PowerDNS DNSdist, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

When the early_acl_drop (earlyACLDrop in Lua) option is disabled (default is enabled) on a DNS over HTTPs frontend using the nghttp2 provider, the ACL check is skipped, allowing all clients to send DoH queries regardless of the configured ACL.

Weakness: CWE-863

Which versions are affected by CVE-2026-24029?

It affects 1 product.

Products include Powerdns Dnsdist.

How do I fix CVE-2026-24029?

Change a configuration setting.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-24029 being exploited?

There is no known exploitation of CVE-2026-24029 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2026-24029, GHSA-hh36-f69g-hq4h, UBUNTU-CVE-2026-24029.