gcdRadar
archive/Patch now/AIR-2026-1351
closedclosed 9 Sep 2026Patch now2 Disclosed vulnerabilityAI

MCP Kotlin SDK vulnerable to buffer growth denial of service

MCP Kotlin SDK

The Model Context Protocol Kotlin SDK fails to cap read buffers from stdio transport when newlines are omitted. This allows peers to exhaust JVM memory and crash the host process.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
6.2
EPSS
<0.01 · top 92% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
9 Sep 2026
last update
9 Sep 2026
CVE ids
CVE-2026-53937other records

Timeline · 1

  1. 9 Sep 2026CVE-2026-53937: MCP Kotlin SDK is the Kotlin Multiplatform software development kit for the Model Context Protocol.

Sources · 1

Advisories and databases

  1. 2026-09-09
    CVE-2026-53937: MCP Kotlin SDK is the Kotlin Multiplatform software development kit for the Model Context Protocol.
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-53937

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
mcpmemory-exhaustion
dates
happened 9 Sep 2026 · first reported 9 Sep 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# MCP Kotlin SDK vulnerable to buffer growth denial of service

https://gcdradar.vercel.app/incidents/mcp-kotlin-sdk-vulnerable-to-buffer-growth-denial-of-service · AIR-2026-1351 · closed 2026-09-09

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-09-09
- AI role: Attack on AI
- Products: MCP Kotlin SDK
- CVE ids: CVE-2026-53937
- CVSS: 6.2

## Summary

The Model Context Protocol Kotlin SDK fails to cap read buffers from stdio transport when newlines are omitted. This allows peers to exhaust JVM memory and crash the host process.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-09-09: CVE-2026-53937: MCP Kotlin SDK is the Kotlin Multiplatform software development kit for the Model Context Protocol. (https://nvd.nist.gov/vuln/detail/CVE-2026-53937)

## Sources

- 2026-09-09 NVD: CVE-2026-53937: MCP Kotlin SDK is the Kotlin Multiplatform software development kit for the Model Context Protocol. https://nvd.nist.gov/vuln/detail/CVE-2026-53937

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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