{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-7828",
        "assignerOrgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c",
        "state": "PUBLISHED",
        "assignerShortName": "securin",
        "dateReserved": "2026-05-05T03:40:50.298Z",
        "datePublished": "2026-07-01T03:33:21.648Z",
        "dateUpdated": "2026-07-09T04:36:02.166Z"
    },
    "containers": {
        "cna": {
            "title": "UltraVNC repeater integer overflow in win_log malloc leading to heap overflow",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "UltraVNC repeater through 1.8.2.2 contains an integer overflow in the HTTP request logging path. In repeater/webgui/settings.c:336, the win_log() function allocates list nodes via malloc(sizeof(struct LIST) + strlen(line)), where line is derived from HTTP request URIs. If strlen(line) is sufficiently large, the addition overflows to a value smaller than sizeof(struct LIST), causing a heap allocation smaller than required. The subsequent strcpy of the full string into the undersized allocation produces a heap buffer overflow. In the current implementation this overflow is bounded by the HTTP receive buffer size (WI_RXBUFSIZE = 153600 bytes, well below SIZE_MAX on 32-bit builds), limiting practical exploitability to a partial heap write. A remote unauthenticated attacker can trigger the theoretical overflow path by sending a maximally-sized URI in an HTTP request to the repeater HTTP port."
                }
            ],
            "affected": [
                {
                    "vendor": "uvnc",
                    "product": "UltraVNC",
                    "versions": [
                        {
                            "version": "0",
                            "lessThanOrEqual": "1.8.2.2",
                            "status": "affected",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected",
                    "modules": [
                        "repeater"
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "type": "CWE",
                            "cweId": "CWE-190",
                            "lang": "en",
                            "description": "Integer Overflow or Wraparound"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ],
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "LOW",
                        "baseScore": 5.3,
                        "baseSeverity": "MEDIUM"
                    }
                }
            ],
            "references": [
                {
                    "url": "https://uvnc.com/",
                    "name": "UltraVNC project page",
                    "tags": [
                        "vendor-advisory"
                    ]
                },
                {
                    "url": "https://github.com/ultravnc/UltraVNC",
                    "name": "UltraVNC source repository",
                    "tags": [
                        "product"
                    ]
                },
                {
                    "url": "https://www.securin.io/zero-days/cve-2026-7828-integer-overflow-win-log-malloc-ultravnc-repeater"
                }
            ],
            "timeline": [
                {
                    "time": "2026-06-02T00:00:00.000Z",
                    "lang": "en",
                    "value": "Vulnerability discovered during security audit"
                },
                {
                    "time": "2026-06-17T00:00:00.000Z",
                    "lang": "en",
                    "value": "Reported to vendor (coordinated disclosure)"
                },
                {
                    "time": "2026-09-15T00:00:00.000Z",
                    "lang": "en",
                    "value": "Planned public disclosure (90-day window)"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Arjun Basnet, Securin (arjun.basnet@securin.io)",
                    "type": "finder"
                }
            ],
            "source": {
                "discovery": "EXTERNAL",
                "advisory": "Securin Security Advisory — FINDING-009"
            },
            "providerMetadata": {
                "orgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c",
                "shortName": "securin",
                "dateUpdated": "2026-07-09T04:36:02.166Z"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-07-01T13:14:15.623029Z",
                                "id": "CVE-2026-7828",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-07-01T13:14:25.539Z"
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    }
}