CVE-2026-27854

Name: CVE-2026-27854
Creator: NVD / NIST
Published: 2026-03-31T12:16:28.053+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.47%

Last modified Jun 17, 2026

CVE-2026-27854 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An attacker might be able to trigger a use-after-free by sending crafted DNS queries to a DNSdist using the DNSQuestion:getEDNSOptions method in custom Lua code. In some cases DNSQuestion:getEDNSOptions might refer to a version of the DNS packet that has been modified, thus triggering a use-after-free and potentially a crash resulting in denial of service.. EPSS estimates a 0.47% chance of exploitation in the next 30 days.

Description

An attacker might be able to trigger a use-after-free by sending crafted DNS queries to a DNSdist using the DNSQuestion:getEDNSOptions method in custom Lua code. In some cases DNSQuestion:getEDNSOptions might refer to a version of the DNS packet that has been modified, thus triggering a use-after-free and potentially a crash resulting in denial of service.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.47%

37.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Powerdns	Dnsdist	>= 1.9.0, < 1.9.12
Powerdns	Dnsdist	>= 2.0.0, < 2.0.3

References

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.htmlVendor Advisory

Timeline

Published: Mar 31, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-27854?

How severe is CVE-2026-27854?

CVE-2026-27854 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.47% probability of exploitation in the next 30 days.

How do I fix CVE-2026-27854?

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-2026-27854?

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

Scan your code now

Source: NVD / NIST