PyPI/mcp CVE-2025-53365: high 8.7, EPSS 0.42%

MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service

Action: Upgrade mcp to 1.10.0 or later.

pip install mcp==1.10.0

Affected

Fixed versions

Sources

• osv: GHSA-j975-95f5-7wqh
• nvd: CVE-2025-53365
• https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh
• https://github.com/modelcontextprotocol/python-sdk/pull/967
• https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891
• https://github.com/advisories/GHSA-j975-95f5-7wqh
• https://github.com/modelcontextprotocol/python-sdk
• https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0
• https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1618.yaml
• https://pypi.org/project/mcp

CVE-2025-53365 · published 2025-07-04T22:06:31Z · modified 2026-07-16T18:45:48.211743797Z · JSON