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Vulnerabilities

Vulnerability · GHSA-f897-62hf-6gxq

MCP TypeScript SDK: HTTP server transports and handlers did not limit request body size or JSON-RPC batch length

Published Oct 27, 2026 · catalog updated Oct 27, 2026 · MCP TypeScript SDK: HTTP

Last checked Oct 28, 2026, 11 days ago.

Open the advisory

Exploitation likelihood is not on this record for GHSA-f897-62hf-6gxq. A missing EPSS score is not a low risk. Compare MCP TypeScript SDK: HTTP with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (MCP TypeScript SDK: HTTP).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Version ranges on file
Affected products
npm @modelcontextprotocol/hono · npm @modelcontextprotocol/node · npm @modelcontextprotocol/sdk · npm @modelcontextprotocol/server

### Summary In affected versions, MCP servers reachable over HTTP put no limit on the size of a POST body or on the number of messages in a JSON-RPC batch. Large requests could exhaust the server's memory, and one long batch could block it from serving anyone else. No credentials were needed, unless your application authenticates requests before they reach the SDK. ### Am I affected? Yes, if clients you do not fully trust can reach your server over Streamable HTTP. A body parser such as does not protect you, because it does not limit batch length. Servers that only use stdio are not affected. Affected versions: - 1.10.0 through 1.30.0 - 2.0.0 - 2.0.0 - 2.0.0 ### Fix Upgrade to: - 1.x: 1.30.1 or later - 2.x: 2.1.0, 2.1.0 and 2.0.1 or later. Upgrade every one you have installed. Bodies over 4 MiB now get , and batches over 100 messages get . If your clients send larger bodies, raise the new option. If you cannot upgrade yet, cap request body size in a reverse proxy.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • npm @modelcontextprotocol/hono>= 2.0.0, < 2.0.1
  • npm @modelcontextprotocol/node>= 2.0.0, < 2.1.0
  • npm @modelcontextprotocol/sdk>= 1.10.0, < 1.30.1
  • npm @modelcontextprotocol/server>= 2.0.0, < 2.1.0

How to fix GHSA-f897-62hf-6gxq

  • Upgrade

    GHSA-f897-62hf-6gxq lists a fix boundary at 2.0.1. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 2.0.1

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for GHSA-f897-62hf-6gxq. A missing EPSS score is not a low risk. Compare MCP TypeScript SDK: HTTP with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with >= 2.0.0, < 2.0.1, >= 2.0.0, < 2.1.0, >= 1.10.0, < 1.30.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-770: Allocation of Resources Without Limits or Throttling. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 27, 2026 · GitHub Advisory Database

    Detected

    ### Summary In affected versions, MCP servers reachable over HTTP put no limit on the size of a POST body or on the number of messages in a JSON-RPC batch. Large requests could exhaust the server's memory, and one long batch could block it from serving anyone else. No credentials were needed, unless your application authenticates requests before they reach the SDK. ### Am I affected? Yes, if clien

  2. Oct 27, 2026 · GitHub Advisory Database

    Updated

    ### Summary In affected versions, MCP servers reachable over HTTP put no limit on the size of a POST body or on the number of messages in a JSON-RPC batch. Large requests could exhaust the server's memory, and one long batch could block it from serving anyone else. No credentials were needed, unless your application authenticates requests before they reach the SDK. ### Am I affected? Yes, if clien

Sources

  • GitHub Advisory DatabasePackage advisoryGHSA-f897-62hf-6gxq

    MCP TypeScript SDK: HTTP server transports and handlers did not limit request body size or JSON-RPC batch length

    github.com

References

Freshness

Last verified in this catalog Oct 27, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • GitHub Advisory DatabaseOct 28, 2026