Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor

{
  "id": "d2244cd3f796405997c5c413d7e65df26b47413e88d0b33425439e02e51c9811",
  "url": "https://osv.dev/vulnerability/CVE-2026-0398",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor",
    "summary": "Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.",
    "evidence": "osv:CVE-2026-0398",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-0398",
      "aliases": [
        "CVE-2026-0398"
      ],
      "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/powerdns/pdns",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f6109dd21a7e7a936912a5c7605a88b4f10719b3"
                },
                {
                  "fixed": "18309fb31837d799371441b8cf1ffae92494f5af"
                },
                {
                  "introduced": "15e4956e960232a6a9dbeea0408955de3060e8c2"
                },
                {
                  "fixed": "15e4956e960232a6a9dbeea0408955de3060e8c2"
                },
                {
                  "introduced": "ff33413345dc6a826ff0f37f0c78cd60cdf15689"
                },
                {
                  "fixed": "0a44ec6431b9c3de2ba173a79e100c7356b46c1f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.1.0"
                      },
                      {
                        "fixed": "5.1.10"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.2.8"
                      },
                      {
                        "fixed": "5.2.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.3.0"
                      },
                      {
                        "fixed": "5.3.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "rec-5.3.4",
            "rec-5.3.1",
            "rec-5.1.8",
            "rec-5.3.0",
            "rec-5.1.7",
            "rec-5.1.6",
            "rec-5.1.4",
            "rec-5.1.3",
            "rec-5.1.1",
            "rec-5.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-0398.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.350346830Z",
      "provider": "osv",
      "references": [
        "https://repo.powerdns.com/",
        "https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2026-01.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/0xxx/CVE-2026-0398.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-0398",
        "https://github.com/PowerDNS/pdns"
      ],
      "provider_metadata": {
        "cna_assigner": "OX",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/0xxx/CVE-2026-0398.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-0398",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497345,
  "published_at": "2026-02-09T14:20:46.592+00:00"
}