CVE-2026-108714 Details
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.
A memory exhaustion vulnerability has been identified in the MCP Kotlin SDK in versions through 0.15.0. This vulnerability allows remote clients to deplete server memory by exploiting the WebSocket transport. The issue arises because the WebSocket implementation lacks a maximum frame size limit, enabling attackers to send small frame headers that declare payloads nearly 2 GiB in size. This manipulation forces significant heap allocations, leading to a denial-of-service condition on the server.
To address this vulnerability, the WebSocket server configuration should be updated to include a maximum frame size limit. This can be done by installing the Ktor WebSockets plugin with a bounded 'maxFrameSize' parameter, ensuring that incoming frames are properly regulated.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 11, 2026CISA-ADP
Assessed Oct 14, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Model Context Protocol MCP Kotlin SDK | <= 0.15.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 14, 2026 | CVE Modified | CISA-ADP |
| Oct 11, 2026 | New CVE Received | [email protected] |