CVE-2025-53365

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2025-53365
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-53365.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-53365
Aliases
Downstream
Published
2025-07-04T22:03:46.893Z
Modified
2026-04-10T05:32:04.968215Z
Severity
  • 8.7 (High) CVSS_V4 - 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 CVSS Calculator
Summary
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport ,Leading to Denial of Service
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/53xxx/CVE-2025-53365.json",
    "cwe_ids": [
        "CWE-248"
    ]
}
References

Affected packages

Git / github.com/modelcontextprotocol/python-sdk

Affected ranges

Type
GIT
Repo
https://github.com/modelcontextprotocol/python-sdk
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
dced22344d80d85884df9c26281fdfe0331e9c65

Affected versions

v1.*
v1.0.0
v1.4.0
v1.4.1
v1.5.0
v1.6.0
v1.7.0
v1.8.0
v1.8.1
v1.9.0
v1.9.1
v1.9.2
v1.9.3
v1.9.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-53365.json"