CVE-2026-50045

Medium

Description

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductNlnetlabs Unbound

PublishedJul 22, 2026

First seenJul 22, 2026

Weakness typeCWE-406CWE-406

How to fix

Update

nlnetlabs unbound1.25.2 or later

Vendor advisories

nlnetlabs.nl/downloads/unbound/CVE-2026-50045.txt

Affected products

Product	Affected versions	Fixed in
nlnetlabs unbound	1.22.0 ≤ v < 1.25.2	1.25.2

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