CVE-2026-50045 MEDIUM

CVE-2026-50045: 'max-global-quota' reset by DNSSEC validation restarts

Vendor Nlnet Labs

Product Unbound

Weakness CWE-406

Published July 22, 2026

Last update July 22, 2026

View on NVD All CVEs

CVSS base score

5.3/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality None

Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

July 22, 2026 CVE published

July 22, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-50045 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/406.html AskarLabs — CWE-406 write-up Insufficient Control of Network Message Volume (Amplification)