LDAP injection in PowerDNS Authoritative - CVE-2026-33609
Published: April 22, 2026
Vulnerability identifier: #VU126868
CSH Severity: Low
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-33609
CWE-ID: CWE-90
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to ldap dn injection in LDAP query escaping when processing regular DNS queries. A remote user can send crafted queries to disclose sensitive information.
Exploitation requires the LDAP backend with 8bit-dns enabled.
Affected software
PowerDNS Authoritative
Debian Linux
Fedora
pdns (Debian package)
pdns
Debian Linux
Fedora
pdns (Debian package)
pdns
How to mitigate CVE-2026-33609
Install security update from vendor's website.
PowerDNS Authoritative - addressed in versions 4.9.14, 5.0.4
pdns (Debian package) - update to 4.9.14-0+deb13u1
pdns - addressed in versions 5.0.4-1.el9, 5.0.4-1.el10_1, 5.0.4-1.el10_2, 5.0.4-1.el10_3, 5.0.4-1.fc42, 5.0.4-1.fc43, 5.0.4-1.fc44
pdns (Debian package) - update to 4.9.14-0+deb13u1
pdns - addressed in versions 5.0.4-1.el9, 5.0.4-1.el10_1, 5.0.4-1.el10_2, 5.0.4-1.el10_3, 5.0.4-1.fc42, 5.0.4-1.fc43, 5.0.4-1.fc44