CVE-2026-42389

Name: CVE-2026-42389
Creator: NVD / NIST
Published: 2026-06-25T14:16:39.653+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.18%

Last modified Jun 25, 2026

CVE-2026-42389 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers.. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.18%

7.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

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-2026-42389?

This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers.

How severe is CVE-2026-42389?

CVE-2026-42389 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.

How do I fix CVE-2026-42389?

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-2026-42389?

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

Scan your code now

Source: NVD / NIST