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CVE-2026-25536

@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

Published: Feb 4, 2026Updated: Feb 5, 2026 Sources: CVE List NVD GHSACWE-362
NVD MITRE
7.1CVSSHIGH
EPSS Score
0.2%
Top 85.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. From version 1.10.0 to 1.25.3, cross-client response data leak when a single McpServer/Server and transport instance is reused across multiple client connections, most commonly in stateless StreamableHTTPServerTransport deployments. This issue has been patched in version 1.26.0.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-362

Affected Products

typescript-sdkmodelcontextprotocol
Mixed
AI / ML / ai-agent-tooling
@modelcontextprotocol/sdknpmOSS Libraries
modelcontextprotocoloss-projectAI / MLaka mcp, model context protocol
npmpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7
github.com
https://github.com/modelcontextprotocol/typescript-sdk/issues/204
github.com
https://github.com/modelcontextprotocol/typescript-sdk/issues/243
github.com
and 2 more references View all →

Timeline

Published
Feb 4, 2026
Last Updated
Feb 5, 2026

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