{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-108714",
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "state": "PUBLISHED",
        "assignerShortName": "VulnCheck",
        "dateReserved": "2026-10-11T01:51:48.616Z",
        "datePublished": "2026-10-11T12:19:27.291Z",
        "dateUpdated": "2026-10-11T12:19:27.291Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
                "shortName": "VulnCheck",
                "dateUpdated": "2026-10-11T12:19:27.291Z"
            },
            "datePublic": "2026-10-10T00:00:00.000Z",
            "title": "MCP Kotlin SDK through 0.15.0 Memory Exhaustion via Application.mcpWebSocket",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "MCP Kotlin SDK through 0.15.0 contains an uncontrolled memory allocation vulnerability that allows remote clients to exhaust server memory because Application.mcpWebSocket installs Ktor WebSockets without a maxFrameSize limit. Attackers can send small frame headers declaring payloads near 2 GiB over one or a few connections, forcing huge heap allocations and causing denial of service."
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "Allocation of Resources Without Limits or Throttling",
                            "cweId": "CWE-770",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "modelcontextprotocol",
                    "product": "kotlin-sdk",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "0",
                            "lessThanOrEqual": "0.15.0",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "packageURL": "pkg:maven/io.modelcontextprotocol/kotlin-sdk-server",
                    "repo": "https://github.com/modelcontextprotocol/kotlin-sdk"
                }
            ],
            "metrics": [
                {
                    "format": "CVSS",
                    "cvssV4_0": {
                        "version": "4.0",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 8.7,
                        "baseSeverity": "HIGH"
                    }
                },
                {
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                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "HIGH",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH"
                    }
                }
            ],
            "references": [
                {
                    "url": "https://hackmd.io/@haind/mcp-kotlin-sdk-websocket-frame-allocation-dos",
                    "tags": [
                        "third-party-advisory"
                    ]
                },
                {
                    "url": "https://github.com/modelcontextprotocol/kotlin-sdk/blob/0.15.0/kotlin-sdk-server/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/server/WebSocketMcpKtorServerExtensions.kt#L41-L63",
                    "tags": [
                        "technical-description"
                    ]
                },
                {
                    "url": "https://github.com/modelcontextprotocol/kotlin-sdk/blob/0.15.0/kotlin-sdk-core/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/shared/WebSocketMcpTransport.kt#L60-L85",
                    "tags": [
                        "technical-description"
                    ]
                },
                {
                    "url": "https://github.com/modelcontextprotocol/kotlin-sdk",
                    "tags": [
                        "product"
                    ]
                },
                {
                    "name": "VulnCheck Advisory: MCP Kotlin SDK through 0.15.0 Memory Exhaustion via Application.mcpWebSocket",
                    "tags": [
                        "third-party-advisory"
                    ],
                    "url": "https://www.vulncheck.com/advisories/mcp-kotlin-sdk-through-0.15.0-memory-exhaustion-via-application-mcpwebsocket"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "HaiND from the Post and Telecommunication Institute of Technology",
                    "type": "finder"
                }
            ],
            "x_generator": {
                "engine": "vulncheck-endgame"
            }
        }
    }
}