CVE-2026-108714
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductModelcontextprotocol Kotlin-sdk
PublishedOct 11, 2026
First seenOct 11, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| modelcontextprotocol kotlin-sdk | v ≤ 0.15.0 | — |
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