PT-2026-23721 · Coredns · Coredns

Younevsky · Published 2026-03-06 · Updated 2026-05-21 · CVE-2026-26017

Positive Technologies (AI Summary)

CVSS v3.1

7.7

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions CoreDNS versions prior to 1.14.2

Description CoreDNS is a DNS server that utilizes a chain of plugins. A flaw in the default plugin execution order allows bypassing of DNS access controls. Specifically, security plugins like acl are evaluated before the rewrite plugin, creating a Time-of-Check Time-of-Use (TOCTOU) condition. This allows unauthorized DNS access.

Recommendations Update to version 1.14.2 or later.

Exploit

Fix

Time Of Check To Time Of Use

Weakness Enumeration

CWE-367

Related Identifiers

AZL-79497

AZL-79526

CLEANSTART-2026-VJ54611

CVE-2026-26017

GHSA-C9V3-4PV7-87PR

GO-2026-4630

OPENSUSE-SU-2026:10297-1

OPENSUSE-SU-2026:20619-1

SUSE-SU-2026:1042-1

Affected Products

Coredns

References · 211

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26017.json · Exploit
• https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87pr · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-13281 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-5187 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-32934 · Security Note
• https://osv.dev/vulnerability/GHSA-c9v3-4pv7-87pr · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-39836 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-58063 · Security Note
• https://osv.dev/vulnerability/CVE-2026-26017 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33190 · Security Note
• https://osv.dev/vulnerability/GO-2026-4630 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-64702 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-39825 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:20619-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-35579 · Security Note