Vulnerability Details CVE-2026-50045
In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, a single client query for a deeply nested name under a DNSSEC-signed parent can cause Unbound to send more upstream packets per client query than the configured 'max-global-quota'. This effectively bypasses a security configuration that limits upstream amplification traffic.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 21.1%
CVSS Severity
CVSS v3 Score 5.3
Products affected by CVE-2026-50045
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cpe:2.3:a:nlnetlabs:unbound:1.22.0
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cpe:2.3:a:nlnetlabs:unbound:1.23.0
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cpe:2.3:a:nlnetlabs:unbound:1.23.1
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cpe:2.3:a:nlnetlabs:unbound:1.24.0
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cpe:2.3:a:nlnetlabs:unbound:1.24.1
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cpe:2.3:a:nlnetlabs:unbound:1.24.2
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cpe:2.3:a:nlnetlabs:unbound:1.25.0
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cpe:2.3:a:nlnetlabs:unbound:1.25.1