SB2026042703 - Fedora 44 update for pdns
Published: April 27, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Resource exhaustion (CVE-ID: CVE-2026-33610)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in forward-dnsupdate when processing responses from a primary server during a forwarded dnsupdate operation. A remote attacker can act as a rogue primary server and send crafted responses to cause a denial of service.
Exploitation requires a secondary server to forward a DNS update request to the primary server.
2) Integer overflow (CVE-ID: CVE-2026-33611)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote user to corrupt data and cause a denial of service.
The vulnerability exists due to integer overflow in HTTPS and SVCB record handling when processing crafted REST API requests. A remote privileged user can send a crafted REST API request to corrupt data and cause a denial of service.
Only systems using the LMDB backend are vulnerable to database corruption.
3) LDAP injection (CVE-ID: CVE-2026-33609)
CWE-ID: CWE-90 - Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
CVSSv4: 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/E:U/U:Clear
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.
Remediation
Install update from vendor's website.