CVE-2026-50045

Public on 2026-07-22

Modified on 2026-07-27

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.

Severity

Medium

See what this means

CVSS v3 Base Score

5.3

See breakdown

Affected Packages

Platform	Package	Status
Amazon Linux 2 - Core	unbound	Not Affected
Amazon Linux 2 - Unbound1.17 Extra	unbound	Not Affected
Amazon Linux 2023	unbound	Not Affected

CVSS Scores

	Score Type	Score	Vector
Amazon Linux	CVSSv3	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-50045 Mitre: CVE-2026-50045