{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:nlnetlabs:nsd:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "4.14.0"
              },
              {
                "fixed": "4.14.3"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "5c760d0f00e282e1626cbadfc67e8bb11744f20b"
            },
            {
              "fixed": "fc930b88cb4f628defae9835449065945bda7ddc"
            }
          ],
          "repo": "https://github.com/nlnetlabs/nsd",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {},
  "details": "If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS message with a special crafted SVCB RR with an rdata size of 65512, that let's an (uint16_t) variable that is used to allocate space needed for the RR wrap (because total size \u003e 65535), causing a heap overflow. The attacker can perform a controlled (RCE class) head write of up to 65509 bytes",
  "id": "CVE-2026-12244",
  "modified": "2026-07-08T05:37:51.654888765Z",
  "published": "2026-06-25T07:16:44.900Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12244.txt"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}