VulnerabilityModified
CVE-2026-26017
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.
MEDIUM 6.3EPSS 0.39%
Does this matter?
Lower severity and a low EPSS score (0.39%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 6.3 MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
- EPSS
- 0.39% probability · 32th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-367
- Affected
- coredns.io/coredns
- Source
- security-advisories@github.com
References
- https://github.com/coredns/coredns/releases/tag/v1.14.2Product, Release Notes
- https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87prMitigation, Vendor Advisory
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.