Insufficient verification of data authenticity in PowerDNS Recursor - CVE-2026-52686

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Main Vulnerability Database Vulnerabilities #VU139171

Insufficient verification of data authenticity in PowerDNS Recursor - CVE-2026-52686

Published: July 22, 2026


Vulnerability identifier: #VU139171
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-52686
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to poison the cache.

The vulnerability exists due to improper validation in the wildcard CNAME proof validation logic when processing a crafted reply from an authoritative server containing specific wildcards. A remote attacker can send a crafted reply to poison the cache.

Exploitation is limited to very specific cases outside of the attacker's control.


Affected software

PowerDNS Recursor
Debian Linux
pdns-recursor (Debian package)

How to mitigate CVE-2026-52686

Install security update from vendor's website.

PowerDNS Recursor - addressed in versions 5.2.12, 5.3.9, 5.4.4
pdns-recursor (Debian package) - update to 5.2.12-0+deb13u1

External References

Related Security Bulletins