CVE
CVE-2026-26017
CoreDNS ACL Bypass
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.
Package Versions Affected
Package Version
patch Availability
No items found.
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Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request
CVSS Version
Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.7
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
C
H
U
7.7
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Related Resources
No items found.
References
https://github.com/coredns/coredns/releases/tag/v1.14.2, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26017.json, https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87pr, https://nvd.nist.gov/vuln/detail/CVE-2026-26017
Basic Information
Ecosystem
