{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-12244",
        "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
        "state": "PUBLISHED",
        "assignerShortName": "NLnet Labs",
        "dateReserved": "2026-06-15T06:46:44.866Z",
        "datePublished": "2026-06-25T05:24:08.548Z",
        "dateUpdated": "2026-06-25T12:45:34.403Z"
    },
    "containers": {
        "cna": {
            "title": "Heap overflow and crash with crafted SVCB RR",
            "references": [
                {
                    "tags": [
                        "vendor-advisory"
                    ],
                    "url": "https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12244.txt"
                }
            ],
            "solutions": [
                {
                    "lang": "en",
                    "value": "This issue is fixed starting with version 4.14.3."
                }
            ],
            "affected": [
                {
                    "defaultStatus": "unaffected",
                    "product": "NSD",
                    "vendor": "NLnet Labs",
                    "versions": [
                        {
                            "version": "4.14.0",
                            "lessThan": "4.14.3",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "Qifan Zhang from Palo Alto Networks"
                }
            ],
            "timeline": [
                {
                    "lang": "en",
                    "time": "2026-05-28T00:00:00.000Z",
                    "value": "Issue reported by Qifan Zhang"
                },
                {
                    "lang": "en",
                    "time": "2026-06-12T00:00:00.000Z",
                    "value": "NLnet Labs shares patch"
                },
                {
                    "lang": "en",
                    "time": "2026-06-15T00:00:00.000Z",
                    "value": "Qifan Zhang verifies patch"
                },
                {
                    "lang": "en",
                    "time": "2026-06-25T00:00:00.000Z",
                    "value": "Fix released with version 4.14.3"
                }
            ],
            "datePublic": "2026-06-25T00:00:00.000Z",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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 > 65535), causing a heap overflow. The attacker can perform a controlled (RCE class) head write of up to 65509 bytes"
                }
            ],
            "metrics": [
                {
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "Processing of a zonefile containing a crafted SVCB. These can be provided by a trusted primary"
                        }
                    ],
                    "cvssV4_0": {
                        "baseScore": 8.7,
                        "baseSeverity": "HIGH",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    },
                    "format": "CVSS"
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-190",
                            "description": "CWE-190: Integer Overflow or Wraparound",
                            "lang": "en",
                            "type": "CWE"
                        },
                        {
                            "cweId": "CWE-122",
                            "description": "CWE-122: Heap-based Buffer Overflow",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "x_generator": {
                "engine": "cvelib 1.8.0"
            },
            "providerMetadata": {
                "orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
                "shortName": "NLnet Labs",
                "dateUpdated": "2026-06-25T05:24:08.548Z"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-06-25T12:45:15.927329Z",
                                "id": "CVE-2026-12244",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-06-25T12:45:34.403Z"
                }
            }
        ]
    }
}