medium · CVSS v3 5.3 · EPSS 0.00238

CVE-2026-96405

NLnet Labs Unbound up to and including version 1.26.1 limits compression-pointer traversal for each individual domain-na…

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.

Scores

Severity
medium
CVSS v2
5
CVSS v3
5.3
CVSS v4
—
EPSS
0.00238

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