CoreDNS: rewrite-plugin EDNS0 response-revert nil-pointer panic (remote DoS) when a downstream plugin returns a response with no OPT record

{
  "id": "a14394229617bac8e193175015345ad013a1957c9853386b1f42d24f76b8fc79",
  "url": "https://osv.dev/vulnerability/CVE-2026-62299",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CoreDNS: rewrite-plugin EDNS0 response-revert nil-pointer panic (remote DoS) when a downstream plugin returns a response with no OPT record",
    "summary": "CoreDNS is a DNS server written in Go. Prior to 1.14.5, the CoreDNS rewrite plugin supports edns0 rewrite rules with an optional revert flag, and two response rules, edns0SetResponseRule and edns0ReplaceResponseRule[T] in plugin/rewrite/edns0.go, call res.IsEdns0() and immediately dereference the returned *dns.OPT without a nil check when a downstream plugin returns a response with no OPT record. A remote, unauthenticated client can send a single ordinary DNS query matching a rewrite edns0 ... revert rule, causing ResponseReverter in plugin/rewrite/reverter.go to panic, return SERVFAIL, and degrade availability, or crash the CoreDNS process if the debug directive disables recovery. This issue is fixed in version 1.14.5.",
    "evidence": "osv:CVE-2026-62299",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-62299",
      "aliases": [
        "CVE-2026-62299",
        "GHSA-9pmm-cxww-rrr7"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/coredns/coredns",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "adba3b3703408ffe80bc03a7be0f6ea9c2372399"
                },
                {
                  "fixed": "fc447d0658b093edc8cd29a6b171216a44a644c2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:coredns.io:coredns:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.14.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "fc447d0658b093edc8cd29a6b171216a44a644c2"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "adba3b3703408ffe80bc03a7be0f6ea9c2372399"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.14.5"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.14.4",
            "v1.14.3",
            "v1.14.2",
            "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-2026-62299.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.669625701Z",
      "provider": "osv",
      "references": [
        "https://github.com/coredns/coredns/releases/tag/v1.14.5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62299.json",
        "https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-62299",
        "https://github.com/coredns/coredns/commit/fc447d0658b093edc8cd29a6b171216a44a644c2",
        "https://github.com/coredns/coredns/pull/8190"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-476"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62299.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-62299",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499408,
  "published_at": "2026-07-16T19:44:36.475+00:00"
}