Vulnerabilities CVE-2026-26017

CVE-2026-26017

High

Open

TLP:CLEAR

CoreDNS ACL Bypass

NVD CVE.org

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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.

Details

CVSS Score: 7.7
EPSS Score ⓘ: 0.39%

31.7th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Confidence: 90%
Published: Mar 6, 2026
Last Modified: Jul 15, 2026

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