WS-2026-0146
Published:October 15, 2026
Updated:October 22, 2026
@modelcontextprotocol/sdk 1.10.0-1.30.0, @modelcontextprotocol/server and @modelcontextprotocol/node 2.0.0 (and prereleases), @modelcontextprotocol/hono 2.0.0 (and prereleases): HTTP server transports and handlers put no limit on request body size or JSON-RPC batch length, so an unauthenticated client can exhaust memory or block the server (GHSA-f897-62hf-6gxq)
Affected Packages
https://github.com/modelcontextprotocol/typescript-sdk.git (GITHUB):
Affected version(s) >=@modelcontextprotocol/hono@2.0.0-alpha.1 <@modelcontextprotocol/hono@2.0.1Fix Suggestion:
Update to version @modelcontextprotocol/hono@2.0.1https://github.com/modelcontextprotocol/typescript-sdk.git (GITHUB):
Affected version(s) >=1.10.0 <1.30.1Fix Suggestion:
Update to version 1.30.1https://github.com/modelcontextprotocol/typescript-sdk.git (GITHUB):
Affected version(s) >=@modelcontextprotocol/server@2.0.0-alpha.1 <@modelcontextprotocol/server@2.1.0Fix Suggestion:
Update to version @modelcontextprotocol/server@2.1.0https://github.com/modelcontextprotocol/typescript-sdk.git (GITHUB):
Affected version(s) >=@modelcontextprotocol/node@2.0.0-alpha.1 <@modelcontextprotocol/node@2.1.0Fix Suggestion:
Update to version @modelcontextprotocol/node@2.1.0@modelcontextprotocol/hono (NPM):
Affected version(s) >=2.0.0-alpha.2 <2.0.1Fix Suggestion:
Update to version 2.0.1@modelcontextprotocol/server (NPM):
Affected version(s) >=2.0.0-alpha.1 <2.1.0Fix Suggestion:
Update to version 2.1.0@modelcontextprotocol/node (NPM):
Affected version(s) >=2.0.0-alpha.4 <2.1.0Fix Suggestion:
Update to version 2.1.0@modelcontextprotocol/sdk (NPM):
Affected version(s) >=1.10.0 <1.30.1Fix Suggestion:
Update to version 1.30.1Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling