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CVE-2026-81642 is a heap-based buffer overflow in the DNSSEC validator of NLnet Labs Unbound through version 1.26.0. During DNSKEY digest processing, a malicious DNSKEY record whose owner-name compression pointer refers to its own RDATA can cause overflow of the digest buffer. The condition can be triggered when a vulnerable resolver queries an attacker-controlled DNS zone and processes the crafted DNSSEC data.
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A heap-buffer-overflow vulnerability during DNSKEY digest processing that could permit remote code execution.
A heap buffer overflow in Unbound DNSKEY digest processing that could enable remote code execution.
A heap buffer overflow in Unbound DNSKEY digest processing that may permit remote code execution.
A digest-buffer overflow in the DNSSEC validator of NLnet Labs Unbound through version 1.26.0. A malicious DNS zone containing a crafted DNSKEY whose owner compression pointer references its own RDATA can trigger denial of service and potentially remote code execution when queried by a vulnerable Unbound instance.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.