CVE-2026-108714: Allocation of Resources Without Limits or Throttling in modelcontextprotocol kotlin-sdk
Description
CVE-2026-108714 is a high-severity vulnerability in the modelcontextprotocol kotlin-sdk (up to version 0.15.0) involving uncontrolled memory allocation. The issue arises because the Application.mcpWebSocket component uses Ktor WebSockets without a maximum frame size limit, allowing remote attackers to send frames with payloads near 2 GiB. This can cause excessive heap memory allocation, leading to denial of service.
CVSS v4.0
Score 8.7high
Affected software
modelcontextprotocol
kotlin-sdk
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The modelcontextprotocol kotlin-sdk through version 0.15.0 contains a vulnerability where the Application.mcpWebSocket installs Ktor WebSockets without enforcing a maxFrameSize limit. Remote attackers can exploit this by sending WebSocket frames with headers indicating very large payload sizes (close to 2 GiB), which forces the server to allocate large amounts of memory. This uncontrolled allocation can exhaust server memory resources and cause a denial of service condition.
Potential Impact
Successful exploitation allows remote attackers to exhaust server memory by forcing large heap allocations through oversized WebSocket frames. This results in denial of service, potentially disrupting availability of services relying on the kotlin-sdk.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider implementing external WebSocket frame size limits or filtering at network or application layers to prevent oversized frames.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-11T01:51:48.616Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6acb85be2cdf04f656d09a07
Added to database: 10/11/2026, 12:49:02 UTC
Last enriched: 10/11/2026, 13:18:17 UTC
Last updated: 10/11/2026, 21:33:22 UTC
Views: 11
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