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GHSA-22jm-h49p-29qw

MCP TypeScript SDK: Experimental tasks were not tied to the session that created them

Source: GitHub Advisory Database (reviewed) High CVE-2026-111767

Packages

EcosystemPackageAffectedFixed in
npm @modelcontextprotocol/sdk >= 1.24.0, < 1.32.0 1.32.0

Details

As written in the advisory (Markdown source, shown as plain text).

### Summary In affected versions, the experimental tasks feature (`taskStore`) did not check which session created a task. Clients sharing one `InMemoryTaskStore` could list, read and cancel each other's tasks. Experimental tasks are deprecated. The 2026-07-28 specification replaced them with a redesigned extension. The best course of action is to stop using them. ### Am I affected? Only if your HTTP server passes `taskStore` to `McpServer` or `Server`. If `grep -ri taskstore --exclude-dir=node_modules .` finds nothing, you are not affected. Affected versions: `@modelcontextprotocol/sdk` 1.24.0 through 1.31.0. The 2.x packages are not affected. ### Fix Upgrade to `@modelcontextprotocol/sdk` 1.32.0 or later. Each task is now tied to the session that created it, so a client that starts a new session can no longer reach its earlier tasks. If you cannot upgrade yet, remove `taskStore`, or create one `InMemoryTaskStore` per session.

References

External links from the advisory. They lead to third-party sites.