CVE-2026-52870
2 advisories.
PyPI/mcp CVE-2026-52870: high 7.6, EPSS 0.39%
MCP Python SDK: Experimental task handlers allow any client to access and cancel other clients' tasks
Action: Upgrade mcp to 1.27.2 or later.
pip install mcp==1.27.2Affected
| introduced | fixed | last affected |
|---|---|---|
| 1.23.0 | 1.27.2 | - |
Fixed versions
| 1.27.2 |
Sources
- osv: GHSA-hvrp-rf83-w775
- https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-hvrp-rf83-w775
- https://nvd.nist.gov/vuln/detail/CVE-2026-52870
- https://github.com/modelcontextprotocol/python-sdk/pull/2720
- https://github.com/modelcontextprotocol/python-sdk/commit/62137874ff26dd74d2fea80ff528a7fd9ca7a5e7
- https://github.com/modelcontextprotocol/python-sdk
- https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.27.2
CVE-2026-52870 · published · modified · JSON
PyPI/mcp CVE-2026-52870: high 7.6, EPSS 0.39%
MCP Python SDK: Experimental task handlers allow any client to access and cancel other clients' tasks
Action: Upgrade mcp to 1.27.2 or later.
pip install mcp==1.27.2Affected
| introduced | fixed | last affected |
|---|---|---|
| 1.23.0 | 1.27.2 | - |
Fixed versions
| 1.27.2 |
Sources
- osv: PYSEC-2026-3481
- https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-hvrp-rf83-w775
- https://nvd.nist.gov/vuln/detail/CVE-2026-52870
- https://github.com/modelcontextprotocol/python-sdk/pull/2720
- https://github.com/modelcontextprotocol/python-sdk/commit/62137874ff26dd74d2fea80ff528a7fd9ca7a5e7
- https://github.com/modelcontextprotocol/python-sdk
- https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.27.2
- https://pypi.org/project/mcp
- https://github.com/advisories/GHSA-hvrp-rf83-w775
CVE-2026-52870 · published · modified · JSON