Resource exhaustion in PowerDNS Authoritative - CVE-2026-33610
Published: April 22, 2026
Vulnerability identifier: #VU126867
CSH Severity: Medium
CVSS v4: 8.2 [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]
CVE-ID: CVE-2026-33610
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
PowerDNS Authoritative
Debian Linux
Fedora
pdns (Debian package)
pdns
Debian Linux
Fedora
pdns (Debian package)
pdns
How to mitigate CVE-2026-33610
Install security update from vendor's website.
PowerDNS Authoritative - addressed in versions 4.9.14, 5.0.4
pdns (Debian package) - update to 4.9.14-0+deb13u1
pdns - addressed in versions 5.0.4-1.el9, 5.0.4-1.el10_1, 5.0.4-1.el10_2, 5.0.4-1.el10_3, 5.0.4-1.fc42, 5.0.4-1.fc43, 5.0.4-1.fc44
pdns (Debian package) - update to 4.9.14-0+deb13u1
pdns - addressed in versions 5.0.4-1.el9, 5.0.4-1.el10_1, 5.0.4-1.el10_2, 5.0.4-1.el10_3, 5.0.4-1.fc42, 5.0.4-1.fc43, 5.0.4-1.fc44