CVE-2026-26017

EUVD-2026-10042
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.
TOCTOU
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.7 HIGH
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 30%
Affected Products (NVD)
VendorProductVersion
coredns.iocoredns
𝑥
< 1.14.2
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.13
1782924920 ≤
𝑥
< *
ADP
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.13
1782924937 ≤
𝑥
< *
ADP
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.14
1780204232 ≤
𝑥
< *
ADP
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.14
1780204249 ≤
𝑥
< *
ADP
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.15
1774086225 ≤
𝑥
< *
ADP
Azure Linux logo
Azure Linux Releases
Azure Package
Release
coredns
Azure Linux 3.0
0:1.11.4-15.azl3
fixed
CBL-Mariner 2.0
0:1.11.1-26.cm2
fixed
Common Weakness Enumeration
References
https://github.com/coredns/coredns/releases/tag/v1.14.2
https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87pr
https://access.redhat.com/errata/RHSA-2026:25127
https://access.redhat.com/errata/RHSA-2026:36873
https://access.redhat.com/errata/RHSA-2026:8151
https://access.redhat.com/security/cve/CVE-2026-26017
https://bugzilla.redhat.com/show_bug.cgi?id=2445244
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26017.json