GHSA-j975-95f5-7wqh

Suggest an improvement
Source
https://github.com/advisories/GHSA-j975-95f5-7wqh
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/07/GHSA-j975-95f5-7wqh/GHSA-j975-95f5-7wqh.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-j975-95f5-7wqh
Aliases
  • CVE-2025-53365
Published
2025-07-04T22:06:31Z
Modified
2025-07-05T02:25:38.468804Z
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

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.

Thank you to Rich Harang for reporting this issue.

Database specific
{
    "nvd_published_at": "2025-07-04T22:15:22Z",
    "severity": "HIGH",
    "github_reviewed_at": "2025-07-04T22:06:31Z",
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-248"
    ]
}
References

Affected packages

PyPI / mcp

Package

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.10.0

Affected versions

0.*

0.9.1

1.*

1.0.0
1.1.0
1.1.1
1.1.2
1.1.3
1.2.0rc1
1.2.0
1.2.1
1.3.0rc1
1.3.0
1.4.0
1.4.1
1.5.0
1.6.0
1.7.0
1.7.1
1.8.0
1.8.1
1.9.0
1.9.1
1.9.2
1.9.3
1.9.4