CVE-2026-81642 — Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY
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…
Published: 2026-09-16 · CVSS: 9.1 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7