High 7.7Published Mar 6, 2026

CVE-2026-26017CoreDNS ACL Bypass

Updated under an hour ago (Oct 26, 2026, 9:00 PM ET)

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It affects coredns and 4 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for coredns

Exploited in the last 30 days

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.

CVSS: 7.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Weakness (CWE): CWE-367
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

coredns coredns coredns:coredns (from the name)	before 1.14.2	CNA record
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13 redhat:acm	from 1782924920 not affected	CISA ADP
Red Hat Red Hat Connectivity Link 1 redhat:connectivity_link	1	CISA ADP
Red Hat Red Hat OpenShift Container Platform 4 redhat:openshift	4	CISA ADP
coredns.io coredns coredns.io:coredns	before 1.14.2	NVD

References

References

https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87pr	x-refsource-confirm, mitigation, vendor-advisory
https://github.com/coredns/coredns/releases/tag/v1.14.2	x-refsource-misc, product, release-notes
https://access.redhat.com/errata/RHSA-2026:25127
https://access.redhat.com/errata/RHSA-2026:36873
https://access.redhat.com/errata/RHSA-2026:8151
https://access.redhat.com/security/cve/CVE-2026-26017
https://bugzilla.redhat.com/show_bug.cgi?id=2445244
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26017.json

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.