RTKLIB 2.4.3 – Out-of-bounds Write in decode_type1033 via Crafted RTCM3 Message_CVE-2026-56786

{
    "lastseen": "",
    "description": "RTKLIB through 2.4.3 contains an out-of-bounds write vulnerability in decode_type1033 function that fails to clamp length counters to destination buffer size, allowing up to 191-byte overflow into fixed 64-byte descriptor fields. An attacker controlling an NTRIP or serial RTCM3 correction stream can craft a valid CRC-bearing type-1033 message to corrupt adjacent rtcm_t object members, potentially achieving arbitrary code execution or denial of service.",
    "published": "2026-06-25T18:11:55.232Z",
    "modified": "2026-06-25T18:11:55.232Z",
    "type": "cve",
    "title": "RTKLIB 2.4.3 - Out-of-bounds Write in decode_type1033 via Crafted RTCM3 Message",
    "source": "VulnCheck",
    "references": "https://github.com/tomojitakasu/RTKLIB/issues/799\nhttps://www.vulncheck.com/advisories/rtklib-out-of-bounds-write-in-decode-type1033-via-crafted-rtcm3-message",
    "id": "CVE-2026-56786",
    "bulletinFamily": "",
    "cwe": [
        "CWE-787"
    ],
    "cvelist": null,
    "sourceData": "tomojitakasu RTKLIB 0",
    "sourceHref": "",
    "cvss": {
        "score": 9.3,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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": "RTKLIB",
    "version": "0",
    "vendor": "tomojitakasu",
    "ai_description": "Out-of-bounds write vulnerability in decode_type1033 function allowing arbitrary code execution or denial of service",
    "ai_severity": "Critical",
    "ai_vendor": "tomojitakasu",
    "ai_product": "RTKLIB",
    "ai_version": "2.4.3",
    "ai_score": 9.3
}