CVE-2026-10846

A flaw was found in ldns. When applications use ldns as a resolver over User Datagram Protocol (UDP), it fails to properly match the query's destination address and port with the response's source address and port. Additionally, the query ID and question are not matched with the response. This vulnerability allows a remote attacker to perform off-path poisoning attacks, potentially leading to DNS cache poisoning and redirection to malicious resources.

This Important flaw in ldns, when utilized as a UDP stub resolver, allows remote attackers to conduct off-path DNS poisoning attacks. The vulnerability stems from insufficient validation of DNS query and response parameters, including destination/source addresses, ports, query IDs, and questions. This can lead to DNS cache poisoning, potentially redirecting users to malicious resources.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.