Overly permissive cross-domain whitelist in dnsdist - CVE-2026-0397
Published: April 23, 2026
Vulnerability identifier: #VU126955
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-0397
CWE-ID: CWE-942
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: PowerDNS.COM B.V.
Affected software:
dnsdist
dnsdist
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose information about the running configuration from the dashboard.
The vulnerability exists due to a cross-origin resource sharing policy misconfiguration in the internal webserver dashboard when an administrator logged to the dashboard visits a malicious website. A remote attacker can trick the administrator into visiting a malicious website to disclose information about the running configuration from the dashboard.
The issue is present only when the internal webserver is enabled.
How to mitigate CVE-2026-0397
Install security update from vendor's website.