{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-92707",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-09-16T16:22:31.542Z",
        "datePublished": "2026-10-15T18:35:49.074Z",
        "dateUpdated": "2026-10-15T20:12:15.468Z"
    },
    "containers": {
        "cna": {
            "title": "MessagePack: Nested arrays can blow past buffer length limits",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1325",
                            "lang": "en",
                            "description": "CWE-1325: Improperly Controlled Sequential Memory Allocation",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "LOW",
                        "baseScore": 5.3,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-qhrr-8q5h-9q3h",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-qhrr-8q5h-9q3h"
                },
                {
                    "name": "https://github.com/MessagePack-CSharp/MessagePack-CSharp/commit/7fd78bbf3476e03beae8b0f7a521125525a8a64a",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/MessagePack-CSharp/MessagePack-CSharp/commit/7fd78bbf3476e03beae8b0f7a521125525a8a64a"
                },
                {
                    "name": "https://github.com/MessagePack-CSharp/MessagePack-CSharp/commit/95b63fca4f7097d3cac12d1a95286af4b4bbf02c",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/MessagePack-CSharp/MessagePack-CSharp/commit/95b63fca4f7097d3cac12d1a95286af4b4bbf02c"
                },
                {
                    "name": "https://github.com/MessagePack-CSharp/MessagePack-CSharp/releases/tag/v2.5.303",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/MessagePack-CSharp/MessagePack-CSharp/releases/tag/v2.5.303"
                },
                {
                    "name": "https://github.com/MessagePack-CSharp/MessagePack-CSharp/releases/tag/v3.1.9",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/MessagePack-CSharp/MessagePack-CSharp/releases/tag/v3.1.9"
                }
            ],
            "affected": [
                {
                    "vendor": "MessagePack-CSharp",
                    "product": "MessagePack-CSharp",
                    "versions": [
                        {
                            "version": "< 2.5.303",
                            "status": "affected"
                        },
                        {
                            "version": ">= 3.0.0, < 3.1.9",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-15T18:35:49.074Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.303 and 3.1.9, deserializing attacker-controlled MessagePack data as System.Object through PrimitiveObjectFormatter can cause excessive memory allocation. The formatter allocates an object[] from each declared array length before the configured object-graph depth limit rejects the input, while nested array headers can reuse the same trailing unread bytes to satisfy per-header length validation. A comparatively small payload can therefore keep many large arrays alive at once. When an attacker can submit such data repeatedly, the allocations can cause severe managed-heap pressure, excessive garbage collection, process termination, or loss of service. Exposure requires an application to deserialize untrusted data through the affected formatter path and permit repeated attacker-controlled submissions, such as a reachable ASP.NET Core SignalR hub method with an object parameter and AddMessagePackProtocol() enabled. This issue is fixed in versions 2.5.303 and 3.1.9."
                }
            ],
            "source": {
                "advisory": "GHSA-qhrr-8q5h-9q3h",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-15T20:10:28.719217Z",
                                "id": "CVE-2026-92707",
                                "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": "2026-10-15T20:12:15.468Z"
                }
            }
        ]
    }
}