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  5. CVE-2026-25536

CVE-2026-25536: @modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

February 4, 2026 (updated February 5, 2026)

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.

References

  • github.com/advisories/GHSA-345p-7cg4-v4c7
  • github.com/modelcontextprotocol/typescript-sdk
  • github.com/modelcontextprotocol/typescript-sdk/issues/204
  • github.com/modelcontextprotocol/typescript-sdk/issues/243
  • github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7
  • nvd.nist.gov/vuln/detail/CVE-2026-25536

Code Behaviors & Features

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Affected versions

All versions starting from 1.10.0 before 1.26.0

Fixed versions

  • 1.26.0

Solution

Upgrade to version 1.26.0 or above.

Impact 7.1 HIGH

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

Learn more about CVSS

Weakness

  • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Source file

npm/@modelcontextprotocol/sdk/CVE-2026-25536.yml

Spotted a mistake? Edit the file on GitLab.

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