---
id: CVE-2026-63655
title: >-
  tsParticles: Unbounded HTTP Request Body Buffering in @tsparticles/mcp-server
  Leads to Remote DoS
summary: >-
  tsParticles is a TypeScript library for creating highly customizable particle
  animations. Prior to 4.3.1, the HTTP mode of @tsparticles/mcp-server accepts
  unauthenticated POST /mcp requests in integrations/mcp-server/src/index.ts and
  acc…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-400
vendor: tsparticles
product: tsparticles
affected:
  - tsparticles < 4.3.1
  - mcp-server < 4.3.1
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-05T20:18:43.794353Z'
exploitAvailable: true
published: '2026-11-04'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:19:03.619Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-63655'
references:
  - url: >-
      https://github.com/tsparticles/tsparticles/security/advisories/GHSA-447x-qqwf-m7xq
    label: >-
      https://github.com/tsparticles/tsparticles/security/advisories/GHSA-447x-qqwf-m7xq
  - url: 'https://github.com/tsparticles/tsparticles/pull/5875'
    label: 'https://github.com/tsparticles/tsparticles/pull/5875'
  - url: >-
      https://github.com/tsparticles/tsparticles/commit/25fb70e7f527a91568adaef576570289083f243b
    label: >-
      https://github.com/tsparticles/tsparticles/commit/25fb70e7f527a91568adaef576570289083f243b
  - url: >-
      https://github.com/tsparticles/tsparticles/commit/7b3a9488d4201fe9ddd5fec05f4a2ae65d3627ea
    label: >-
      https://github.com/tsparticles/tsparticles/commit/7b3a9488d4201fe9ddd5fec05f4a2ae65d3627ea
  - url: 'https://github.com/tsparticles/tsparticles/releases/tag/v4.3.1'
    label: 'https://github.com/tsparticles/tsparticles/releases/tag/v4.3.1'
tags:
  - cve.org
  - exploit-available
epss: 0.00431
epssPercentile: 0.37591
ingestedAt: '2026-11-05T22:38:31.731Z'
---

## Overview

tsParticles is a TypeScript library for creating highly customizable particle animations. Prior to 4.3.1, the HTTP mode of @tsparticles/mcp-server accepts unauthenticated POST /mcp requests in integrations/mcp-server/src/index.ts and accumulates every request-body chunk in a Buffer[] without a cumulative size limit before Buffer.concat and JSON.parse. A remote attacker can stream an arbitrarily large body to exhaust Node.js process memory and terminate the service, including in the official Docker configuration that exposes HTTP mode on 0.0.0.0:3000. Confidentiality and integrity are not affected. This issue is fixed in version 4.3.1.

## Affected

- `tsparticles < 4.3.1`
- `mcp-server < 4.3.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.