Insufficient verification of data authenticity in PowerDNS Recursor - CVE-2026-42390

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Main Vulnerability Database Vulnerabilities #VU135384

Insufficient verification of data authenticity in PowerDNS Recursor - CVE-2026-42390

Published: June 25, 2026


Vulnerability identifier: #VU135384
CSH Severity: Medium
CVSS v4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42390
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass ZONEMD validation.

The vulnerability exists due to improper verification of cryptographic signature in ZONEMD validation when processing a crafted zone. A remote attacker can send a crafted zone to bypass ZONEMD validation.

This is only relevant if ZoneToCache is configured with ZONEMD validation.


Affected software

PowerDNS Recursor
Debian Linux
pdns-recursor (Debian package)

How to mitigate CVE-2026-42390

Install security update from vendor's website.

PowerDNS Recursor - addressed in versions 5.2.11, 5.3.8, 5.4.3
pdns-recursor (Debian package) - update to 5.2.11-0+deb13u1

External References

Related Security Bulletins