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CVE-2026-26017

CoreDNS ACL Bypass

Published: Mar 6, 2026Updated: Jul 15, 2026 Sources: CVE List NVD GHSACWE-367
7.7HIGH
NVD MITRE
EPSS Score
0.4%
Top 68.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-367

Affected Products

coredns.io
oss-projectaka coredns
corednsOn-prem
Networking Infrastructure / dns-dhcp-ntp
Go
package-ecosystem
github.com/coredns/coredns
OSS Libraries
and 1 more affected products View all →

Exploitability

Official Patch Available
Workaround Available
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Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

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 7 more references View all →

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