CVE-2026-55973 'dns-error-reporting: yes' leads to stack buffer overflow

In NLnet Labs Unbound 1.23.0 up to and including 1.25.1, when 'dns-error-reporting: yes' is set, the EDNS Report-Channel option code 18 from the last upstream response is read and uses the option's length as the length of the agent domain. When a domain name check is performed on the agent domain...

CVE-2026-55973

In NLnet Labs Unbound 1.23.0 up to and including 1.25.1, when 'dns-error-reporting: yes' is set, the EDNS Report-Channel option code 18 from the last upstream response is read and uses the option's length as the length of the agent domain. When a domain name check is performed on the agent domain...

PT-2026-63389

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.23.0 through 1.25.1 Description When the dns-error-reporting: yes setting is enabled, the software incorrectly processes the EDNS Report-Channel option code 18 from upstream responses. Specifically, it uses the...