NULL pointer dereference in PowerDNS Recursor - CVE-2026-33262
Published: April 22, 2026
Vulnerability identifier: #VU126851
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-2026-33262
CWE-ID: CWE-476
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 null pointer dereference in cookie reply handling when processing crafted DNS responses. A remote attacker can send a crafted DNS response to cause a denial of service.
Note, cookies are disabled by default.
Affected software
PowerDNS Recursor
How to mitigate CVE-2026-33262
Install security update from vendor's website.
PowerDNS Recursor - update to 5.4.1