[ CVE-2026-96405 · Published 21 Oct 2026 ]
Vulnerability in NLnet Labs Unbound
CVSS 5.3
EPSS <1%1 agency advisoryNo fix listed yet
[ Description ]Official description
NLnet Labs Unbound up to and including version 1.26.1 limits compression-pointer traversal for each individual domain-name operation but has no aggregate inbound decompression-work budget. Many chained compression pointers in a message results in a lot of CPU usage following them. A malicious actor with recursive-query access and control of an ordinarily delegated authority that serves specially crafted replies can exploit the vulnerability and degrade Unbound's general performance.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ Advisories ]Government CERT advisories
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BSI CERT-BundWID-SEC-2026-4073
Unbound: Multiple vulnerabilities Translated from German