CVE-2026-50045

FAUCET Score

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.

First published: Jul 22, 2026Last modified: Jul 22, 2026

Impacted Technologies

Vendor	Product	Version(s)	CPE
		>= 1.22.0, < 1.25.2CPE matchmatch criteria	cpe:2.3:a:nlnetlabs:unbound::::::::

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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 Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

Exploitability Score

3.9

Impact Score

1.4

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.28%

Probability of exploitation in next 30 days

EPSS Percentile

20.0%

Percentile rank of EPSS score among Peer Group

As of 2026-07-26

Model: v2026.06.15

This CVE's current EPSS score of 0.0028 is in the 11th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

microsoftpatch availablevia msrc

Product: azl3 unbound 1.25.1-1 on Azure Linux 3.0Fixed in: 1.25.2-1

Vendor Advisories (1)

microsoft2026-Jul/CVE-2026-50045Moderate

'max-global-quota' reset by DNSSEC validation restarts

Jul 14, 2026

References

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

Vendor Advisory