CVE-2026-111767 MCP TypeScript SDK: Experimental tasks were not tied to the session that created them
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-111767?
CVE-2026-111767 is a high-severity vulnerability in modelcontextprotocol typescript-sdk, published on 20 Oct 2026.
Official description
MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. From version 1.24.0 to before version 1.32.0, 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. This issue has been patched in version 1.32.0.
Which versions are affected by CVE-2026-111767?
2 open source packages ship an affected version, including @modelcontextprotocol/sdk.
| Package | Affected | Fixed in |
|---|---|---|
@modelcontextprotocol/sdk npm | From 1.24.0 | 1.32.0 |
@modelcontextprotocol/sdk npm | From 1.24.0 | 1.32.0 |
How do I fix CVE-2026-111767?
Upgrade @modelcontextprotocol/sdk to 1.32.0 or later.
Is CVE-2026-111767 being exploited?
There is no known exploitation of CVE-2026-111767 in the wild and no public exploit code.
Sources
Also known as CLSA-2026-1793097252, CLSA-2026-1793102531, ECHO-9411-00b8-28d5, GHSA-22jm-h49p-29qw, MINI-xh2p-cwp5-5g43, ROOT-APP-NPM-CVE-2026-111767.