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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-111768
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-05 22:17:45 UTC
Updated2026-11-05 22:17:45 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-770 | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Modelcontextprotocol Typescript-sdk affected >= 1.3.0, < 1.32.0 Not specified
CNA @modelcontextprotocol Server affected >= 2.0.0, < 2.3.0 Not specified
CNA @modelcontextprotocol Sdk affected >= 1.3.0, < 1.32.0 Not specified

References

ReferenceSourceLinkTags
github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-... [email protected] github.com
github.com/modelcontextprotocol/typescript-sdk/commit/fd26801b3b387742fe... [email protected] github.com
github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0 [email protected] github.com
github.com/modelcontextprotocol/typescript-sdk/pull/2927 [email protected] github.com
github.com/modelcontextprotocol/typescript-sdk/pull/2926 [email protected] github.com
github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontex... [email protected] github.com
github.com/modelcontextprotocol/typescript-sdk/commit/6d8dbc6cb590edf766... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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