CVE-2026-26017
High
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.
SeverityHigh
CVSS7.7
Exploit probability—
ProductCoredns
PublishedMar 6, 2026
First seenMar 6, 2026
Weakness typeCWE-367CWE-367
How to fix
Update
- coredns.io coredns1.14.2 or later
- github.com/coredns/coredns1.14.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| coredns.io coredns | v < 1.14.2 | 1.14.2 |
| github.com/coredns/corednsGo | v < 1.14.2 | 1.14.2 |
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