CVE-2026-111768

    Dashboard / Vulnerabilities / CVE-2026-111768

    CVE-2026-111768

    Published: 5 Nov 2026Last Modified: 7 Nov 2026

    Summary: Model Context Protocol TypeScript SDK: One HTTP request within the default size limit could exhaust server memory during validation

    Details: 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.

    References: https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0, https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/[email protected], https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111768.json, https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-46jr-4wx8-v453, https://nvd.nist.gov/vuln/detail/CVE-2026-111768, https://github.com/modelcontextprotocol/typescript-sdk/commit/6d8dbc6cb590edf766fcb66b636ca6b654e99c37, https://github.com/modelcontextprotocol/typescript-sdk/commit/fd26801b3b387742fe24a90ed4b275dd6072209f, https://github.com/modelcontextprotocol/typescript-sdk/pull/2926, https://github.com/modelcontextprotocol/typescript-sdk/pull/2927

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 438505b74ceaacfb7b28ab9e877c728ba5e19479
    Fixed -32549b00a9a808265f35a29f92fdf27fa4aac2ef

    Affected versions

    1.31.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-111768 | CVE-DB