CoreDNS ACL Bypass
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.7epss 0.4%
exploitation probability
0.4%top 69% of all CVEs
observed exploitation
nono source reports it
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:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Affected products
coredns · corednsReferences
https://access.redhat.com/errata/RHSA-2026:25127https://access.redhat.com/errata/RHSA-2026:36873https://access.redhat.com/errata/RHSA-2026:8151https://access.redhat.com/security/cve/CVE-2026-26017https://bugzilla.redhat.com/show_bug.cgi?id=2445244https://github.com/coredns/coredns/releases/tag/v1.14.2https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87prhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26017.json