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CVE-2026-26017

7.7 · HIGH

CoreDNS is a DNS server that chains plugins.

Published Mar 6, 2026CWE-367EPSS 0.48%

Overview

CVE-2026-26017 is a high-severity vulnerability. It was published on March 6, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a logical vulnerability in CoreDNS allows DNS access controls to be bypassed due to the default execution order of plugins. Security plugins such as acl are evaluated before the rewrite plugin, resulting in a Time-of-Check Time-of-Use (TOCTOU) flaw. This issue has been patched in version 1.14.2.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/coredns/coredns/releases/tag/v1.14.2GitHubgithub.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87prRefaccess.redhat.com/errata/RHSA-2026:25127Refaccess.redhat.com/errata/RHSA-2026:36873Refaccess.redhat.com/errata/RHSA-2026:8151Refaccess.redhat.com/security/cve/CVE-2026-26017Refbugzilla.redhat.com/show_bug.cgi?id=2445244Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26017.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-26017?

CVE-2026-26017 is a high-severity vulnerability. It was published on March 6, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

How severe is CVE-2026-26017?

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-26017?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-26017?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-26017 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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