Resource exhaustion in PowerDNS Recursor - CVE-2026-0398
Published: February 9, 2026
Vulnerability identifier: #VU122485
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-0398
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can trigger memory exhaustion by publishing and querying a crafted zone.
Affected software
PowerDNS Recursor
Debian Linux
Fedora
pdns-recursor (Debian package)
pdns-recursor
Debian Linux
Fedora
pdns-recursor (Debian package)
pdns-recursor
How to mitigate CVE-2026-0398
Install updates from vendor's website.
PowerDNS Recursor - addressed in versions 5.1.10, 5.2.8, 5.3.5
pdns-recursor (Debian package) - update to 5.2.8-0+deb13u1
pdns-recursor - addressed in versions 5.2.11-1.fc43, 5.4.3-1.el10_2, 5.4.3-1.el10_3, 5.4.3-1.fc44
pdns-recursor (Debian package) - update to 5.2.8-0+deb13u1
pdns-recursor - addressed in versions 5.2.11-1.fc43, 5.4.3-1.el10_2, 5.4.3-1.el10_3, 5.4.3-1.fc44