Insufficient verification of data authenticity in PowerDNS Recursor - CVE-2026-42390
Published: June 25, 2026
Vulnerability identifier: #VU135384
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-42390
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: PowerDNS.COM B.V.
Affected software:
PowerDNS Recursor
PowerDNS Recursor
Detailed vulnerability description
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.
How to mitigate CVE-2026-42390
Install security update from vendor's website.