chore(deps): update dependency mcp to v1.23.0 [security] #8
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This PR contains the following updates:
1.9.1->1.23.0MCP Python SDK vulnerability in the FastMCP Server causes validation error, leading to DoS
CVE-2025-53366 / GHSA-3qhf-m339-9g5v
More information
Details
A validation error in the MCP SDK can cause an unhandled exception when processing malformed requests, resulting in service unavailability (500 errors) until manually restarted. Impact may vary depending on the deployment conditions, and presence of infrastructure-level resilience measures.
Thank you to Rich Harang for reporting this issue.
Severity
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service
CVE-2025-53365 / GHSA-j975-95f5-7wqh
More information
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.
Severity
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Model Context Protocol (MCP) Python SDK does not enable DNS rebinding protection by default
CVE-2025-66416 / GHSA-9h52-p55h-vw2f
More information
Details
Description
The Model Context Protocol (MCP) Python SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost without authentication using
FastMCPwith streamable HTTP or SSE transport, and has not configuredTransportSecuritySettings, a malicious website could exploit DNS rebinding to bypass same-origin policy restrictions and send requests to the local MCP server. This could allow an attacker to invoke tools or access resources exposed by the MCP server on behalf of the user in those limited circumstances.Note that running HTTP-based MCP servers locally without authentication is not recommended per MCP security best practices. This issue does not affect servers using stdio transport.
Servers created via
FastMCP()now have DNS rebinding protection enabled by default when thehostparameter is127.0.0.1orlocalhost. Users are advised to update to version1.23.0to receive this automatic protection. Users with custom low-level server configurations usingStreamableHTTPSessionManagerorSseServerTransportdirectly should explicitly configureTransportSecuritySettingswhen running an unauthenticated server on localhost.Severity
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Release Notes
modelcontextprotocol/python-sdk (mcp)
v1.23.0Compare Source
Summary
This release brings us up to speed with the latest MCP spec
2025-11-25. Take a look at the latest spec as well as the release blog post.What's Changed
d3a1841)New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.22.0...v1.23.0
v1.22.0Compare Source
What's Changed
ClientSessionGroup.call_tooland.connect_to_serverby @inaku-Gyan in #1576jsonschemalibrary by @wuliang229 in #1596New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.21.1...v1.22.0
v1.21.2Compare Source
Hotfix Release
This is a hotfix release to address a critical bug in OAuth scope handling that caused failures on 401 responses.
Related:
What's Changed
New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.21.1...v1.21.2
v1.21.1Compare Source
What's Changed
func_metadata()implementation by @Viicos in #1496New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.21.0...v1.21.1
v1.21.0Compare Source
What's Changed
ClientSessionGroupdoc string by @inaku-Gyan in #1572New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.20.0...v1.21.0
v1.20.0Compare Source
What's Changed
New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.19.0...v1.20.0
v1.19.0Compare Source
What's Changed
New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.18.0...v1.19.0
v1.18.0Compare Source
What's Changed
New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.17.0...v1.18.0
v1.17.0Compare Source
What's Changed
New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.16.0...v1.17.0
v1.16.0Compare Source
What's Changed
New Contributors 🙏
Full Changelog: modelcontextprotocol/python-sdk@1.15.0...v1.16.0
v1.15.0Compare Source
What's Changed
New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.14.1...v1.15.0
v1.14.1Compare Source
What's Changed
New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.14.0...v1.14.1
v1.14.0Compare Source
What's Changed
New Contributors 🙏
Full Changelog: modelcontextprotocol/python-sdk@v1.13.1...v1.14.0
v1.13.1Compare Source
What's Changed
New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.13.0...v1.13.1
v1.13.0Compare Source
What's Changed
New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.12.4...v1.13.0
v1.12.4Compare Source
What's Changed
response_modes_supportedmember ofOAuthMetadataby @joesavage-silabs in #1243New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.12.3...v1.12.4
v1.12.3Compare Source
What's Changed
New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.12.2...v1.12.3
v1.12.2Compare Source
What's Changed
Full Changelog: modelcontextprotocol/python-sdk@v1.12.1...v1.13.0
v1.12.1Compare Source
What's Changed
RequestIdis not coerced asintby @Kludex in #1178New Contributors
Full Changelog: modelcontextprotocol/python-sdk@v1.12.0...v1.12.1
v1.12.0Compare Source
What's Changed
inline_snapshot.Ison parametrized test by @Kludex in #945New Contributors 🙏
Full Changelog: modelcontextprotocol/python-sdk@v1.11.0...v1.12.0
v1.11.0Compare Source
What's Changed
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