CVE-2026-26017
CoreDNS ACL Bypass
- State
- Published
- Severity
- 7.7 High
- Published
- Mar 6, 2026
- Updated
- Jul 15, 2026
- Reserved
- Feb 9, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.7 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N | GitHub_M |
| 3.1 | 7.7 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N | redhat-SADP |
Weaknesses
- CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
Affected Products
| Product | Versions |
|---|---|
corednscoredns |
|
References
- https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87pr
- https://github.com/coredns/coredns/releases/tag/v1.14.2
- https://access.redhat.com/security/cve/CVE-2026-26017vdb-entry
- RHBZ#2445244issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26017.json
- https://access.redhat.com/errata/RHSA-2026:36873vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:25127vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8151vendor-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.