CVE-2026-50045: Nlnetlabs Unbound

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Nlnetlabs Unbound: from 1.22.0, before 1.25.2 (fixed in 1.25.2)

Published 2026-07-22. Last modified 2026-07-24.