High severity7.5NVD Advisory· Published Oct 11, 2026
CVE-2026-108714
CVE-2026-108714
Description
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2<=0.15.0+ 1 more
- (no CPE)range: <=0.15.0
- (no CPE)
Patches
Vulnerability mechanics
References
4- github.com/modelcontextprotocol/kotlin-sdk/blob/0.15.0/kotlin-sdk-core/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/shared/WebSocketMcpTransport.ktnvd
- github.com/modelcontextprotocol/kotlin-sdk/blob/0.15.0/kotlin-sdk-server/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/server/WebSocketMcpKtorServerExtensions.ktnvd
- hackmd.io/@haind/mcp-kotlin-sdk-websocket-frame-allocation-dosnvd
- www.vulncheck.com/advisories/mcp-kotlin-sdk-through-0.15.0-memory-exhaustion-via-application-mcpwebsocketnvd
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