Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-108714— MCP Kotlin SDK through 0.15.0 Memory Exhaustion via Application.mcpWebSocket

Quick assessment

Affected
modelcontextprotocol kotlin-sdk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MCP Kotlin SDK 在 0.15.0 及之前版本中存在一个未受控内存分配漏洞，该漏洞允许远程客户端耗尽服务器内存。由于 Application.mcpWebSocket 在未设置 maxFrameSize 限制的情况下安装了 Ktor WebSockets，攻击者可以在一个或多个连接上发送声明负载接近 2 GiB 的小帧头，从而强制分配大量堆内存，最终导致拒绝服务（DoS）。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
modelcontextprotocol kotlin-sdk ≤ 0.15.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-108714

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
MCP Kotlin SDK through 0.15.0 Memory Exhaustion via Application.mcpWebSocket
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
modelcontextprotocol kotlin-sdk 0 ~ 0.15.0 -

II. Public POCs for CVE-2026-108714

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-108714

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-108714 (1)

Security Blog Posts for CVE-2026-108714 (1)

IV. Related Vulnerabilities

Same vendor: modelcontextprotocol
Same weakness: CWE-770

V. Comments for CVE-2026-108714

No comments yet

Leave a comment