{"cve":"CVE-2025-53365","nvd":{"published":"2025-07-04T22:15:22.117","modified":"2026-06-17T09:38:05.940","status":"Deferred","description":"The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to version 1.10.0, if a client deliberately triggers an exception after establishing a streamable HTTP session, this can lead to an uncaught ClosedResourceError on the server side, causing the server to crash and requiring a restart to restore service. Impact may vary depending on the deployment conditions, and presence of infrastructure-level resilience measures. Version 1.10.0 contains a patch for the issue.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":null,"cwes":["CWE-248"],"references":["https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891","https://github.com/modelcontextprotocol/python-sdk/pull/967","https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:04:28.436527499+00:00"},"epss":{"cve":"CVE-2025-53365","score":0.00419,"percentile":0.36253,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-j975-95f5-7wqh","url":"https://osv.dev/vulnerability/GHSA-j975-95f5-7wqh","summary":"MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service","modified":"2026-07-16T18:45:48.211743797Z","packages":[{"ecosystem":"PyPI","name":"mcp","purl":"pkg:pypi/mcp","ranges":["<1.10.0"],"fixed":["1.10.0"]}]},{"id":"PYSEC-2026-1618","url":"https://osv.dev/vulnerability/PYSEC-2026-1618","summary":"MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service","modified":"2026-07-07T17:47:04.395676741Z","packages":[{"ecosystem":"PyPI","name":"mcp","purl":"pkg:pypi/mcp","ranges":["<1.10.0"],"fixed":["1.10.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}