CVE-2026-81642
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
| Vendors | Product | Versions |
|---|---|---|
| nlnetlabs | unbound | < 1.26.1 |
Related articles
Exploited Cisco ISE Flaw Leads a Wave of Attacks on Trusted Software Channels
Active exploitation of a critical Cisco ISE flaw highlights attacks through trusted software channels, Orkes, Discourse, libheif and AI plugins.
Unbound DNSSEC Heap Overflow Puts Vulnerable Resolvers at Risk of Remote Code Execution
NLnet Labs patched CVE-2026-81642, a critical Unbound DNSSEC heap overflow before 1.26.1 that allows DoS or RCE via malicious DNSKEY. Upgrade now.
This product uses the NVD API but is not endorsed or certified by the NVD.