CoreDNS ACL Bypass

{
  "id": "5990deb93fa0ac990cc01d17d6a4ca736fe70aa6f30af315c4a2d178795e5d46",
  "url": "https://osv.dev/vulnerability/CVE-2026-26017",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CoreDNS ACL Bypass",
    "summary": "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.",
    "evidence": "osv:CVE-2026-26017",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-26017",
      "aliases": [
        "CVE-2026-26017",
        "GHSA-c9v3-4pv7-87pr",
        "GO-2026-4630"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/coredns/coredns",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "dd1df4f5db93767a44e37638df44969503b320d2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.14.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "dd1df4f5db93767a44e37638df44969503b320d2"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.14.2"
                  },
                  {
                    "cpe": "cpe:2.3:a:coredns.io:coredns:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.14.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.14.1",
            "v1.14.0",
            "v1.13.2",
            "v1.13.1",
            "v1.13.0",
            "v1.12.4",
            "v1.12.3",
            "v1.12.2",
            "v1.12.1",
            "v1.12.0",
            "v1.11.4",
            "v1.11.3",
            "v1.11.1",
            "v1.11.0",
            "v1.10.1",
            "v1.10.0",
            "v1.9.4",
            "v1.9.3",
            "v1.9.2",
            "v1.9.1",
            "v1.9.0",
            "v1.8.7",
            "v1.8.6",
            "v1.8.5",
            "v1.8.4",
            "v1.8.3",
            "v1.8.2",
            "v1.8.1",
            "v1.8.0",
            "v1.7.1",
            "v1.7.0",
            "v1.6.9",
            "v1.6.8",
            "v1.6.7",
            "v1.6.6",
            "v1.6.5",
            "v1.6.4",
            "v1.6.3",
            "v1.6.2",
            "v1.6.1",
            "v1.6.0",
            "v1.5.2",
            "v1.5.1",
            "v1.5.0",
            "v1.4.0",
            "v1.3.1",
            "v1.3.0",
            "v1.2.6",
            "v1.2.5",
            "v1.2.4",
            "v1.2.3",
            "v1.2.2",
            "v1.2.1",
            "v1.2.0",
            "v1.1.4",
            "v1.1.3",
            "v1.1.2",
            "v1.1.1",
            "v1.1.0",
            "v1.0.6",
            "v1.0.5",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0",
            "v0.9.10",
            "v0.9.9",
            "v011",
            "v010",
            "v009",
            "v008",
            "v007",
            "v006",
            "v005",
            "v004",
            "v003",
            "v002",
            "v001"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26017.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.337492008Z",
      "provider": "osv",
      "references": [
        "https://github.com/coredns/coredns/releases/tag/v1.14.2",
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26017.json",
        "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://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26017.json",
        "https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87pr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-26017",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2445244"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-367"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26017.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-26017",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521251,
  "published_at": "2026-03-06T15:36:15.655+00:00"
}