Vulnerability Description
In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remote code execution is possible through attacker controlled data. An adversary can exploit the vulnerability by controlling a malicious zone and querying a vulnerable Unbound.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-81642?
CVE-2026-81642 is a documented vulnerability. In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. ...
How severe is CVE-2026-81642?
CVSS scoring is not yet available for CVE-2026-81642. Check NVD for updates.
Is there a patch for CVE-2026-81642?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.