1. Home
  2. CVE Database
  3. CVE-2026-50045
MEDIUM · 5.3

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 th...

Vulnerability 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.

CVSS Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW

Affected Products

VendorProductVersions
NlnetlabsUnbound>= 1.22.0, < 1.25.2

Related Weaknesses (CWE)

CWE-406

References

FAQ

What is CVE-2026-50045?

CVE-2026-50045 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 th...

How severe is CVE-2026-50045?

CVE-2026-50045 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-50045?

Check the references section above for vendor advisories and patch information. Affected products include: Nlnetlabs Unbound.