Denial of service via crafted DoH exchange

{
  "id": "0b7e1011b095fc0b1a63e3c7e1ffd8309875fd676d22c03e4751eb8f5672363e",
  "url": "https://osv.dev/vulnerability/CVE-2025-30194",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Denial of service via crafted DoH exchange",
    "summary": "When DNSdist is configured to provide DoH via the nghttp2 provider, an attacker can cause a denial of service by crafting a DoH exchange that triggers an illegal memory access (double-free) and crash of DNSdist, causing a denial of service. The remedy is: upgrade to the patched 1.9.9 version. A workaround is to temporarily switch to the h2o provider until DNSdist has been upgraded to a fixed version. We would like to thank Charles Howes for bringing this issue to our attention.",
    "evidence": "osv:CVE-2025-30194",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-30194",
      "aliases": [
        "CVE-2025-30194"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/powerdns/pdns",
              "type": "GIT",
              "events": [
                {
                  "introduced": "298a9d67fb760a12eabe89164f92fb814572aea8"
                },
                {
                  "fixed": "18d1656b232e3d9ed907b8df2257285c12a5ef1d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.9.0"
                      },
                      {
                        "fixed": "1.9.9"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "dnsdist-1.9.8",
            "dnsdist-1.9.7",
            "dnsdist-1.9.6",
            "dnsdist-1.9.5",
            "dnsdist-1.9.4",
            "dnsdist-1.9.3",
            "dnsdist-1.9.2",
            "dnsdist-1.9.1",
            "dnsdist-1.9.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-30194.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:35.879819087Z",
      "provider": "osv",
      "references": [
        "https://repo.powerdns.com/",
        "https://www.vicarius.io/vsociety/posts/cve-2025-30194-detection-dnsdist-vulnerability",
        "https://www.vicarius.io/vsociety/posts/cve-2025-30194-mitigate-dnsdist-vulnerability",
        "https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-02.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/30xxx/CVE-2025-30194.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-30194",
        "https://github.com/PowerDNS/pdns"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-416"
        ],
        "cna_assigner": "OX",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/30xxx/CVE-2025-30194.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-30194",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 503297,
  "published_at": "2025-04-29T11:25:47.141+00:00"
}