CVE-2026-26017
CoreDNS ACL Bypass
7.7CVSSHIGH
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.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:LPrivileges RequiredLow
UI:NUser InteractionNone
Scope
S:CScopeChanged
Impact
C:HConfidentialityHigh
I:NIntegrityNone
A:NAvailabilityNone
Weaknesses
Affected Products
Attack Graph
Products CVE Techniques Tactics
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Exploitability
Official Patch Available
MITRE ATT&CK
1 technique Privilege Escalation
References
https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87pr
github.com
https://github.com/coredns/coredns/releases/tag/v1.14.2
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-26017
nvd.nist.gov
and 1 more references View all →
Timeline
Published
Mar 6, 2026
Last Updated
Mar 6, 2026
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