CVE-2026-111768: MCP TypeScript SDK suffered from request validation memory exhaustion

# CVE-2026-111768: MCP TypeScript SDK suffered from request validation memory exhaustion

https://gcdradar.vercel.app/incidents/cve-2026-111768-mcp-typescript-sdk-suffered-from-request-val · AIR-2026-1434 · closed 2026-10-20

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-10-20
- AI role: Attack on AI
- Products: MCP TypeScript SDK
- CVE ids: CVE-2026-111768
- CVSS: 7.5

## Summary

The MCP TypeScript SDK lacked limits on array elements and object keys during request validation, allowing a single crafted HTTP request within size limits to exhaust server memory. This caused the process to crash with a JavaScript heap out of memory error.

## What to do

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

## Latest updates

- 2026-11-05: NVD record published (https://nvd.nist.gov/vuln/detail/CVE-2026-111768)
- 2026-10-20: CVE-2026-111768: MCP TypeScript SDK: One HTTP request within the default size limit could exhaust server memory during validation (https://github.com/advisories/GHSA-46jr-4wx8-v453)

## Sources

- 2026-10-20 GitHub Advisory Database: CVE-2026-111768: MCP TypeScript SDK: One HTTP request within the default size limit could exhaust server memory during validation https://github.com/advisories/GHSA-46jr-4wx8-v453
- 2026-11-05 NVD: CVE-2026-111768: The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. https://nvd.nist.gov/vuln/detail/CVE-2026-111768

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