EUVD-2026-10042Published

CoreDNS ACL Bypass

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cve-program · CVE-2026-26017

Published

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.

Source published: 6 Mar 2026 15:36:15 UTC
Source modified: 15 Jul 2026 01:15:36 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

euvd · EUVD-2026-10042

Published

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Mar 6, 2026, 3:36:15 PM

dateUpdated: Jul 15, 2026, 1:15:36 AM

7 related source bulletins · separate from aliases

RHSA-2026:25127: Red Hat Security Advisory: Submariner v0.21 security fixes and container updates

CVE-2024-25621 · CVE-2025-61726 · CVE-2025-61728 · CVE-2025-61729 · CVE-2025-68121 · CVE-2025-68151 · CVE-2026-21441 · CVE-2026-25679 · CVE-2026-26017 · CVE-2026-26018 · CVE-2026-32280 · CVE-2026-32936 · CVE-2026-33186 · CVE-2026-34986 · CVE-2026-35579

RHSA-2026:8151: Red Hat Security Advisory: Submariner v0.22 security fixes and container updates

CVE-2025-61726 · CVE-2025-61728 · CVE-2025-61729 · CVE-2025-68121 · CVE-2025-68151 · CVE-2026-21441 · CVE-2026-25679 · CVE-2026-26017 · CVE-2026-26018 · CVE-2026-27137 · CVE-2026-33186

WID-SEC-W-2026-0627: CoreDNS: Mehrere Schwachstellen

CVE-2026-26017 · CVE-2026-26018

openSUSE-SU-2026:20619-1: Security update for coredns

CVE-2025-61726 · CVE-2025-61728 · CVE-2025-61731 · CVE-2025-68119 · CVE-2025-68121 · CVE-2026-26017 · CVE-2026-26018

openSUSE-SU-2026:10297-1: coredns-1.14.2-1.1 on GA media

CVE-2026-26017 · CVE-2026-26018

RHSA-2026:36873: Red Hat Security Advisory: Submariner v0.20 security fixes and container updates

CVE-2025-47950 · CVE-2025-59530 · CVE-2025-61726 · CVE-2025-61729 · CVE-2025-68121 · CVE-2025-68151 · CVE-2026-26017 · CVE-2026-26018 · CVE-2026-44740 · CVE-2026-53488 · CVE-2026-53492

msrc_CVE-2026-26017: CoreDNS ACL Bypass

CVE-2026-26017

Source published: Mar 6, 2026, 3:36:15 PM (timezone not stated)
Source modified: Jul 15, 2026, 1:15:36 AM (timezone not stated)
Saved here: 15 Nov 2026 12:06:13 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 3.1 · 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

nvd · CVE-2026-26017

Published

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Modified

Weakness classifications: CWE-367

Original publisher date fields

published: 2026-03-06T16:16:10.397

lastModified: 2026-07-15T02:18:59.347

1 source CPE criteria · context only

cpe:2.3:a:coredns.io:coredns:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 6 Mar 2026 16:16:10 UTC
Source modified: 15 Jul 2026 02:18:59 UTC
Saved here: 25 Oct 2026 06:17:22 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · [email protected] · Secondary · 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS 3.1 · [email protected] · Primary · 6.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS 3.1 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c · Secondary · 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

osv · GHSA-c9v3-4pv7-87pr

Published

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. ### Impact In multi-tenant Kubernetes clusters, this flaw undermines DNS-based segmentation strategies. Example scenario: 1. ACL blocks access to *.admin.svc.cluster.local 2. A rewrite rule maps public-name → admin.svc.cluster.local 3. An unprivileged pod queries public-name 4. ACL allows the request 5. Rewrite exposes the internal admin service IP This allows unauthorized service discovery and reconnaissance of restricted internal infrastructure. ### Patches _Has the problem been patched? What versions should users upgrade to?_ ### Workarounds - Reorder the default plugin.cfg so that: - rewrite and other normalization plugins run before acl, opa, and firewall - Ensure all access control checks are applied after name normalization.

Source published: 6 Mar 2026 18:04:00 UTC
Source modified: 10 Sep 2026 03:50:38 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Publisher rating · HIGH

osv · GO-2026-4630

Published

CoreDNS ACL Bypass in github.com/coredns/coredns

Source published: 10 Mar 2026 18:28:10 UTC
Source modified: 23 Mar 2026 04:53:18 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · OSV · upstream source license applies. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.