CVE-2026-40012

Name: CVE-2026-40012
Creator: NVD / NIST
Published: 2026-06-25T14:16:38.84+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.30%

Last modified Jun 25, 2026

CVE-2026-40012 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

Description

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.30%

22.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-524

References

https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-08.html

Timeline

Published: Jun 25, 2026
Last Modified: Jun 25, 2026
Status: Deferred

Frequently Asked Questions

What is CVE-2026-40012?

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

How severe is CVE-2026-40012?

CVE-2026-40012 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2026-40012?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-40012?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST