Security advisory

{
  "id": "9e0d454571aa163e4fafdfb412419b7bb9dab5aa181c2d81c86b93b6ee578439",
  "url": "https://osv.dev/vulnerability/CVE-2019-19331",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-19331",
    "summary": "knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replies with very many resource records might be processed very inefficiently, in extreme cases taking even several CPU seconds for each such uncached message. For example, a few thousand A records can be squashed into one DNS message (limit is 64kB).",
    "evidence": "osv:CVE-2019-19331",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2019-19331",
      "aliases": [
        "CVE-2019-19331"
      ],
      "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/cz-nic/knot-resolver",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "971cbc686ea07f8f257b239b1e109aa7e07efc31"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nic:knot_resolver:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.3.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.2.2",
            "v4.2.0",
            "v4.1.0",
            "v4.0.0",
            "v3.2.1",
            "v3.2.0",
            "v3.1.0",
            "v3.0.0",
            "v2.4.0",
            "v2.3.0",
            "v2.2.0",
            "v2.1.1",
            "v2.1.0",
            "v2.0.0",
            "v1.5.1",
            "v1.5.0",
            "v1.4.0",
            "v1.3.3",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.6",
            "v1.2.1",
            "v1.2.0",
            "v1.2.0-rc3",
            "v1.2.0-rc2",
            "v1.2.0-rc1",
            "v1.1.1",
            "v1.1.0",
            "v1.0.0",
            "v1.0.0-beta3",
            "v1.0.0-beta2",
            "v1.0.0-beta1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-19331.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:35.819619264Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html",
        "https://www.knot-resolver.cz/2019-12-04-knot-resolver-4.3.0.html",
        "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19331"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "10.0"
                  },
                  {
                    "last_affected": "10.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2019-19331",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 433830,
  "published_at": "2019-12-16T16:15:11.66+00:00"
}