Heap overflow and crash with crafted SVCB RR_CVE-2026-12244

{
    "lastseen": "",
    "description": "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",
    "published": "2026-06-25T05:24:08.548Z",
    "modified": "2026-06-25T05:24:08.548Z",
    "type": "cve",
    "title": "Heap overflow and crash with crafted SVCB RR",
    "source": "NLnet Labs",
    "references": "https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12244.txt",
    "id": "CVE-2026-12244",
    "bulletinFamily": "",
    "cwe": [
        "CWE-190",
        "CWE-122"
    ],
    "cvelist": null,
    "sourceData": "NLnet Labs NSD 4.14.0",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "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"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "NSD",
    "version": "4.14.0",
    "vendor": "NLnet Labs",
    "ai_description": "Heap overflow and remote code execution vulnerability in NSD via crafted SVCB RR",
    "ai_severity": "High",
    "ai_vendor": "NLnet Labs",
    "ai_product": "NSD",
    "ai_version": "4.14.0",
    "ai_score": 8.7
}