Bug 2436937 (CVE-2026-25536) - CVE-2026-25536 @modelcontextprotocol/sdk: @modelcontextprotocol/sdk cross-client data leak
Summary: CVE-2026-25536 @modelcontextprotocol/sdk: @modelcontextprotocol/sdk cross-cli...
Keywords:
Status: NEW
Alias: CVE-2026-25536
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-02-04 22:01 UTC by OSIDB Bzimport
Modified: 2026-02-04 23:11 UTC (History)
10 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-02-04 22:01:17 UTC 
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.
Note You need to log in before you can comment on or make changes to this bug.