FKIE_CVE-2026-62299

Vulnerability from fkie_nvd - Published: 2026-07-16 20:16 - Updated: 2026-07-17 19:17
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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 <local|nsid|subnet> <set|append|replace> ... 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.
References
security-advisories@github.comhttps://github.com/coredns/coredns/commit/fc447d0658b093edc8cd29a6b171216a44a644c2
security-advisories@github.comhttps://github.com/coredns/coredns/pull/8190
security-advisories@github.comhttps://github.com/coredns/coredns/releases/tag/v1.14.5
security-advisories@github.comhttps://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "coredns",
          "vendor": "coredns",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.14.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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 \u003clocal|nsid|subnet\u003e \u003cset|append|replace\u003e ... 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."
    }
  ],
  "id": "CVE-2026-62299",
  "lastModified": "2026-07-17T19:17:18.770",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-62299",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-17T17:11:18.131765Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-16T20:16:46.693",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/coredns/coredns/commit/fc447d0658b093edc8cd29a6b171216a44a644c2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/coredns/coredns/pull/8190"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/coredns/coredns/releases/tag/v1.14.5"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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