CVE-2026-42000 Insufficient Validation of Names During AXFR
Attackers can execute arbitrary commands via insufficient validation of names during AXFR transfers in PowerDNS Authoritative.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42000?
CVE-2026-42000 is a medium-severity command injection vulnerability in PowerDNS Authoritative, published on 21 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Insufficient Validation of Names During AXFR
Weakness: CWE-77
Which versions are affected by CVE-2026-42000?
It affects 1 product.
Products include Powerdns Authoritative.
How do I fix CVE-2026-42000?
Apply the vendor's patch.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-42000 being exploited?
There is no known exploitation of CVE-2026-42000 in the wild and no public exploit code.
Other vulnerabilities in PowerDNS Authoritative
Sources
Also known as DEBIAN-CVE-2026-42000, GHSA-cmjg-f724-5qh3, UBUNTU-CVE-2026-42000.