Resource exhaustion in PowerDNS Authoritative - CVE-2026-33610
Published: April 22, 2026
Vulnerability identifier: #VU126867
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-33610
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: PowerDNS.COM B.V.
Affected software:
PowerDNS Authoritative
PowerDNS Authoritative
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in forward-dnsupdate when processing responses from a primary server during a forwarded dnsupdate operation. A remote attacker can act as a rogue primary server and send crafted responses to cause a denial of service.
Exploitation requires a secondary server to forward a DNS update request to the primary server.
How to mitigate CVE-2026-33610
Install security update from vendor's website.