CVE-2026-26017

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.

• CWE-367
• CWE-367

• https://github.com/coredns/coredns/releases/tag/v1.14.2Product, Release Notes
• https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87prMitigation, Vendor Advisory
• 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

Published

Mar 6, 2026

Last Modified

Jul 15, 2026

Status

Modified

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