CVE-2026-52869
2 advisories.
PyPI/mcp CVE-2026-52869: high 7.1, EPSS 0.53%
MCP Python SDK: HTTP transports serve session requests without verifying the authenticated principal
Action: Upgrade mcp to 1.27.2 or later.
pip install mcp==1.27.2Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 1.27.2 | - |
Fixed versions
| 1.27.2 |
Sources
- osv: GHSA-jpw9-pfvf-9f58
- https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-jpw9-pfvf-9f58
- https://nvd.nist.gov/vuln/detail/CVE-2026-52869
- https://github.com/modelcontextprotocol/python-sdk/pull/2690
- https://github.com/modelcontextprotocol/python-sdk/pull/2719
- https://github.com/modelcontextprotocol/python-sdk/commit/1abcca2408a6b50e10ec601181f63f9978705c00
- https://github.com/modelcontextprotocol/python-sdk/commit/ce267b6fc515dc4efc1dc70b6975b16ff0feef0a
- https://github.com/modelcontextprotocol/python-sdk
- https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.27.2
CVE-2026-52869 · published · modified · JSON
PyPI/mcp CVE-2026-52869: high 7.1, EPSS 0.53%
MCP Python SDK: HTTP transports serve session requests without verifying the authenticated principal
Action: Upgrade mcp to 1.27.2 or later.
pip install mcp==1.27.2Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 1.27.2 | - |
Fixed versions
| 1.27.2 |
Sources
- osv: PYSEC-2026-3482
- https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-jpw9-pfvf-9f58
- https://nvd.nist.gov/vuln/detail/CVE-2026-52869
- https://github.com/modelcontextprotocol/python-sdk/pull/2690
- https://github.com/modelcontextprotocol/python-sdk/pull/2719
- https://github.com/modelcontextprotocol/python-sdk/commit/1abcca2408a6b50e10ec601181f63f9978705c00
- https://github.com/modelcontextprotocol/python-sdk/commit/ce267b6fc515dc4efc1dc70b6975b16ff0feef0a
- 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-jpw9-pfvf-9f58
CVE-2026-52869 · published · modified · JSON