CVE-2026-25536

HighCVSS 7.1/10Last modified Jul 15, 2026

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.

Metrics

CVSS 3.1 7.1/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Weakness enumeration

CWE-362 CWE-367

Affected software

Vendor	Product	Versions
modelcontextprotocol	typescript-sdk	>= 1.10.0, < 1.26.0
Red Hat	Red Hat Ansible Automation Platform 2.6	—

References

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

Timeline

Published: Feb 4, 2026
Last modified: Jul 15, 2026
NVD status: Modified

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