CVE-2026-25536

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.

• CWE-362
• CWE-367

• https://github.com/modelcontextprotocol/typescript-sdk/issues/204Issue Tracking, Vendor Advisory
• https://github.com/modelcontextprotocol/typescript-sdk/issues/243Issue Tracking, Vendor Advisory
• https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7Mitigation, Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:3960
• https://access.redhat.com/security/cve/CVE-2026-25536
• https://bugzilla.redhat.com/show_bug.cgi?id=2436937
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25536.json

Published

Feb 4, 2026

Last Modified

Jul 15, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-25530Kanboard is project management software focused on Kanban me…4.3
• CVE-2026-25531Kanboard is project management software focused on Kanban me…4.3
• CVE-2026-25532ESF-IDF is the Espressif Internet of Things (IOT) Developmen…8
• CVE-2026-25533Enclave is a secure JavaScript sandbox designed for safe AI …8.8
• CVE-2026-25534### Impact Spinnaker updated URL Validation logic on user in…9.1
• CVE-2026-25535jsPDF is a library to generate PDFs in JavaScript. Prior to …7.5
• CVE-2026-25537jsonwebtoken is a JWT lib in rust. Prior to version 10.3.0, …7.5
• CVE-2026-25538Devtron is an open source tool integration platform for Kube…8.8
• CVE-2026-25539SiYuan is a personal knowledge management system. Prior to v…7.2
• CVE-2026-2554The WCFM – Frontend Manager for WooCommerce along with Booki…8.1
• CVE-2026-25540Mastodon is a free, open-source social network server based …6.5
• CVE-2026-25541Bytes is a utility library for working with bytes. From vers…7.5