# CVE-2026-76892: tsParticles: Malformed JSON requests can terminate the @tsparticles/mcp-server HTTP process

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

tsParticles is a TypeScript library for creating highly customizable particle animations. Prior to 4.3.1, the HTTP mode of @tsparticles/mcp-server calls JSON.parse outside a request-local error boundary in the POST /mcp handler in integrations/mcp-server/src/index.ts. A single unauthenticated malformed JSON body raises a SyntaxError that terminates the Node.js process, leaving the MCP service unavailable until an external supervisor restarts it. This issue is fixed in version 4.3.1.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- tsparticles / tsparticles: < 4.3.1 (affected). Source: CNA: GitHub_M
- @tsparticles / mcp-server: < 4.3.1 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: GitHub_M

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-248

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/tsparticles/tsparticles/security/advisories/GHSA-4p8p-pjpq-2w7h (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/tsparticles/tsparticles/pull/5875 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/tsparticles/tsparticles/commit/25fb70e7f527a91568adaef576570289083f243b (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/tsparticles/tsparticles/commit/25fb70e7f527a91568adaef576570289083f243b (security-advisories@github.com)

- https://github.com/tsparticles/tsparticles/pull/5875 (security-advisories@github.com)

- https://github.com/tsparticles/tsparticles/security/advisories/GHSA-4p8p-pjpq-2w7h (security-advisories@github.com)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-76892; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-76892; retrieved 2026-11-05; source updated 2026-11-04

Revision: 290ddd6425548a5396006033c9545f5d6e9ae8cab105d1a1ac8d72768743a4cf

Canonical: https://y2.dev/cve/CVE-2026-76892

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.