Answer in brief
CVE-2026-76893 records a Medium severity (CVSS 6.9) vulnerability in tsParticles: A single anonymous MCP session can monopolize HTTP mode and deny new clients. The current sources do not mark it as known exploited. The current feed maps @tsparticles/mcp-server (generic), tsparticles/tsparticles (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps @tsparticles/mcp-server (generic), tsparticles/tsparticles (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| @tsparticles/mcp-servergeneric | <4.3.2 | 4.3.2 |
| tsparticles/tsparticlesgeneric | <4.3.2 | 4.3.2 |
Published upstream
Nov 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 4, 2026
tsParticles is a TypeScript library for creating highly customizable particle animations. Prior to 4.3.2, the HTTP mode of @tsparticles/mcp-server reuses one stateful StreamableHTTPServerTransport for every client. An unauthenticated client that sends the first initialize request without an mcp-session-id claims the shared transport state, causing later independent clients to receive Server already initialized and preventing them from establishing sessions until the process restarts. The first client's session remains functional. This issue is fixed in version 4.3.2.
Quoted source text, attributed separately from HOL analysis.