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.

Score

CVSS 3.1 5.3 Medium

Status

Analyzed - sep@nlnetlabs.nl

Published

2026-07-22

Last modified

2026-10-24

Weaknesses

CWE-406

Affected products

• Unbound (Nlnet Labs)
• Unbound (Nlnetlabs)

References

• https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50045.txt