CVE-2026-33257: Insufficient input validation of internal webserver
Published Apr 22, 2026
·Updated
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.
Affected Software
7 affected components
PowerDNS Authoritative>=4.9.0<4.9.14
PowerDNS Authoritative>=5.0.0<5.0.4
PowerDNS DNSDist>=1.9.0<1.9.13
PowerDNS DNSDist>=2.0.0<2.0.4
PowerDNS recursor>=5.2.0<5.2.9
PowerDNS recursor>=5.3.0<5.3.6
PowerDNS recursor=5.4.0
Event History
Apr 22, 2026
CVE Published
via MITRE·09:37 AM
Data Sourced
via MITRE·09:37 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·10:16 AM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-33257?
CVE-2026-33257 has a severity rating of high (7.5).
2
How do I fix CVE-2026-33257?
To fix CVE-2026-33257, ensure that the internal web server is disabled and apply any relevant patches provided by PowerDNS.
3
What type of vulnerability is CVE-2026-33257?
CVE-2026-33257 is an insufficient input validation vulnerability in the internal web server.
4
What software is affected by CVE-2026-33257?
CVE-2026-33257 affects PowerDNS recursor, PowerDNS Authoritative, and PowerDNS DNSDist.
5
What are the potential impacts of CVE-2026-33257?
The potential impact of CVE-2026-33257 is a denial of service due to unlimited memory allocation.