---
id: CVE-2026-111768
title: >-
  Model Context Protocol TypeScript SDK: One HTTP request within the default
  size limit could exhaust server memory during validation
summary: >-
  The Model Context Protocol TypeScript SDK provides TypeScript client and
  server implementations of the Model Context Protocol. From 1.3.0 until 1.32.0
  in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in
  @modelcontextprotocol/serve…
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-770
vendor: modelcontextprotocol
product: typescript-sdk
affected:
  - 'typescript-sdk >= 1.3.0, < 1.32.0'
  - 'server >= 2.0.0, < 2.3.0'
  - 'sdk >= 1.3.0, < 1.32.0'
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:22:44.119Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111768'
references:
  - url: >-
      https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-46jr-4wx8-v453
    label: >-
      https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-46jr-4wx8-v453
  - url: 'https://github.com/modelcontextprotocol/typescript-sdk/pull/2926'
    label: 'https://github.com/modelcontextprotocol/typescript-sdk/pull/2926'
  - url: 'https://github.com/modelcontextprotocol/typescript-sdk/pull/2927'
    label: 'https://github.com/modelcontextprotocol/typescript-sdk/pull/2927'
  - url: >-
      https://github.com/modelcontextprotocol/typescript-sdk/commit/6d8dbc6cb590edf766fcb66b636ca6b654e99c37
    label: >-
      https://github.com/modelcontextprotocol/typescript-sdk/commit/6d8dbc6cb590edf766fcb66b636ca6b654e99c37
  - url: >-
      https://github.com/modelcontextprotocol/typescript-sdk/commit/fd26801b3b387742fe24a90ed4b275dd6072209f
    label: >-
      https://github.com/modelcontextprotocol/typescript-sdk/commit/fd26801b3b387742fe24a90ed4b275dd6072209f
  - url: 'https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0'
    label: 'https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0'
  - url: >-
      https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0
    label: >-
      https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0
  - url: 'https://github.com/advisories/GHSA-46jr-4wx8-v453'
tags:
  - cve.org
  - ghsa
  - npm
aliases:
  - GHSA-46jr-4wx8-v453
ecosystem: npm
patched:
  - '@modelcontextprotocol/sdk 1.32.0'
  - '@modelcontextprotocol/server 2.3.0'
ingestedAt: '2026-10-20T20:18:14.522Z'
---

## Overview

The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. From 1.3.0 until 1.32.0 in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in @modelcontextprotocol/server, HTTP servers did not enforce a limit on the number of array elements and object keys validated in one request. The affected surface is validation of HTTP requests containing arrays or object keys. The trigger is an array-element or object-key validation workload large enough to exhaust memory while remaining within the request size limit. A single request within the default 4 MiB limit can terminate the process with JavaScript heap exhaustion. No credentials are required unless the application authenticates before SDK processing. Tools accepting arrays or records carry the greatest risk. stdio-only servers do not expose the HTTP request path. Upgrading alone does not enable the new validation bound. Operators must configure both a tool-input element bound and an appropriate request body size limit. This issue is fixed in @modelcontextprotocol/sdk 1.32.0 and @modelcontextprotocol/server 2.3.0.

## Affected

- `typescript-sdk >= 1.3.0, < 1.32.0`
- `server >= 2.0.0, < 2.3.0`
- `sdk >= 1.3.0, < 1.32.0`

## Remediation

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

## Package advisory (CVE-2026-111768)

Affected packages:

- `@modelcontextprotocol/sdk >= 1.3.0, < 1.32.0`
- `@modelcontextprotocol/server >= 2.0.0, < 2.3.0`

Patched in:

- `@modelcontextprotocol/sdk 1.32.0`
- `@modelcontextprotocol/server 2.3.0`

Source: https://github.com/advisories/GHSA-46jr-4wx8-v453