Allocation of Resources Without Limits or Throttling in PowerDNS Recursor - CVE-2026-73206

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Main Vulnerability Database Vulnerabilities #VU156684

Allocation of Resources Without Limits or Throttling in PowerDNS Recursor - CVE-2026-73206

Published: October 21, 2026


Vulnerability identifier: #VU156684
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-2026-73206
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service in PowerDNS Recursor.

The vulnerability exists due to insufficient resource limits in DNS name decompression when processing compression pointers in DNS packets. A remote attacker can send a specially crafted DNS reply from a malicious server to trigger excessive resource consumption and cause a denial of service.


Affected software

PowerDNS Recursor
PowerDNS Authoritative

How to mitigate CVE-2026-73206

Install security update from vendor's website.

PowerDNS Recursor - addressed in versions 5.3.12, 5.4.8
PowerDNS Authoritative - addressed in versions 4.9.18, 5.0.8, 5.1.5

External References

Related Security Bulletins