CVE-2026-42005 Insufficient input validation of internal web server
Attackers can cause denial of service via memory exhaustion in the internal web server, which is disabled by default.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42005?
CVE-2026-42005 is a medium-severity denial of service vulnerability in PowerDNS Authoritative, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.
Weakness: CWE-400
Which versions are affected by CVE-2026-42005?
How do I fix CVE-2026-42005?
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-2026-42005 being exploited?
There is no known exploitation of CVE-2026-42005 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-42005, GHSA-27xg-fw4v-jgv6, UBUNTU-CVE-2026-42005.