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Vulnerability · Published Mar 6, 2026 · Assigned by GitHub_M

CVE-2026-26017CoreDNS ACL Bypass

High 7.7

In plain English

A high-severity security flaw in coredns from coredns. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.4%top 63.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/coredns/coredns1.14.2GO-2026-4630
Gogithub.com/coredns/coredns1.14.2GHSA-c9v3-4pv7-87pr

Affected products (as reported)

VendorProductVersions
coredns coredns < 1.14.2

Weakness: CWE-367 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References