CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service

{
  "id": "84e2f0b4e5ecfcdca5367ec38d033321b5eda312b59df7bb1f72262b85321301",
  "url": "https://osv.dev/vulnerability/CVE-2026-32934",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service",
    "summary": "CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the DNS-over-QUIC (DoQ) server can be driven into unbounded goroutine and memory growth by a remote client that opens many QUIC streams and sends only 1 byte per stream. When the worker pool is full, CoreDNS still spawns a goroutine per accepted stream to wait for a worker token. Additionally, active workers block indefinitely in io.ReadFull() with no per-stream read deadline, allowing an attacker to pin all workers by sending a single byte so the read blocks waiting for the second byte of the DoQ length prefix. This enables an unauthenticated remote attacker to cause memory exhaustion and OOM-kill. This issue has been fixed in version 1.14.3. No known workarounds exist.",
    "evidence": "osv:CVE-2026-32934",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-32934",
      "aliases": [
        "CVE-2026-32934",
        "GHSA-2wpx-qpw2-g5h5",
        "GO-2026-4969"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/coredns/coredns",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "17fceec6d93fd1dde5ba6888c363f131ff6d647f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.14.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "17fceec6d93fd1dde5ba6888c363f131ff6d647f"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.14.3"
                  },
                  {
                    "cpe": "cpe:2.3:a:coredns.io:coredns:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.14.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "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-2026-32934.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:36.877910943Z",
      "provider": "osv",
      "references": [
        "https://github.com/coredns/coredns/releases/tag/v1.14.3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32934.json",
        "https://github.com/coredns/coredns/security/advisories/GHSA-2wpx-qpw2-g5h5",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-32934"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-770"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32934.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-32934",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504260,
  "published_at": "2026-05-05T19:06:17.08+00:00"
}