CVE-2026-111768
Published:October 20, 2026
Updated:October 21, 2026
In affected versions, servers put no limit on how many array elements and object keys they validated in one request. One HTTP request within the default 4 MiB size limit could exhaust the server's memory, and the process aborted with "JavaScript heap out of memory". No credentials are needed, unless you authenticate requests before they reach the SDK.
Affected Packages
https://github.com/modelcontextprotocol/typescript-sdk.git (GITHUB):
Affected version(s) >=1.3.0 <1.32.0Fix Suggestion:
Update to version 1.32.0https://github.com/modelcontextprotocol/typescript-sdk.git (GITHUB):
Affected version(s) >=v2.0.0-beta.1 <v2.3.0Fix Suggestion:
Update to version v2.3.0https://github.com/modelcontextprotocol/typescript-sdk.git (GITHUB):
Affected version(s) >=@modelcontextprotocol/server@2.0.0-alpha.1 <@modelcontextprotocol/server@2.3.0Fix Suggestion:
Update to version @modelcontextprotocol/server@2.3.0@modelcontextprotocol/server (NPM):
Affected version(s) >=2.0.0 <2.3.0Fix Suggestion:
Update to version 2.3.0@modelcontextprotocol/sdk (NPM):
Affected version(s) >=1.3.0 <1.32.0Fix Suggestion:
Update to version 1.32.0Related Resources (6)
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