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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
Description
FastMCP is a Pythonic way to build MCP servers and clients. Prior to version 3.2.0, the OpenAPIProvider in FastMCP exposes internal APIs to MCP clients by parsing OpenAPI specifications. The RequestDirector class is responsible for constructing HTTP requests to the backend service. A vulnerability exists in the _build_url() method. When an OpenAPI operation defines path parameters (e.g., /api/v1/users/{user_id}), the system directly substitutes parameter values into the URL template string without URL-encoding. Subsequently, urllib.parse.urljoin() resolves the final URL. Since urljoin() interprets ../ sequences as directory traversal, an attacker controlling a path parameter can perform path traversal attacks to escape the intended API prefix and access arbitrary backend endpoints. This results in authenticated SSRF, as requests are sent with the authorization headers configured in the MCP provider. This issue has been patched in version 3.2.0.
Metrics
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[{"vendor":"Red Hat","product":"Red Hat Satellite 6.18","defaultStatus":"affected","cpes":["cpe:/a:redhat:satellite:6.18::el9"]},{"vendor":"Red Hat","product":"Red Hat OpenShift AI (RHOAI)","defaultStatus":"unaffected","cpes":["cpe:/a:redhat:openshift_ai"]}]
[{"vendor":"Red Hat","product":"Red Hat Satellite 6.18","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"satellite/foreman-mcp-server-rhel9","cpes":["cpe:/a:redhat:satellite:6.18::el9"],"versions":[{"version":"1782739344","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat OpenShift AI (RHOAI)","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhoai/odh-mlflow-rhel9","cpes":["cpe:/a:redhat:openshift_ai"]},{"vendor":"Red Hat","product":"Red Hat OpenShift AI (RHOAI)","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9","cpes":["cpe:/a:redhat:openshift_ai"]},{"vendor":"Red Hat","product":"Red Hat OpenShift AI (RHOAI)","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhoai/odh-pipeline-runtime-minimal-cpu-py312-rhel9","cpes":["cpe:/a:redhat:openshift_ai"]},{"vendor":"Red Hat","product":"Red Hat OpenShift AI (RHOAI)","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9","cpes":["cpe:/a:redhat:openshift_ai"]},{"vendor":"Red Hat","product":"Red Hat OpenShift AI (RHOAI)","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9","cpes":["cpe:/a:redhat:openshift_ai"]},{"vendor":"Red Hat","product":"Red Hat OpenShift AI (RHOAI)","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9","cpes":["cpe:/a:redhat:openshift_ai"]},{"vendor":"Red Hat","product":"Red Hat OpenShift AI (RHOAI)","de
CVE Modified by redhat-SADP7/08/2026 9:16:36 AM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:36350
Changed
Affected
[{"vendor":"Red Hat","product":"Red Hat Satellite 6","defaultStatus":"affected","cpes":["cpe:/a:redhat:satellite:6"]},{"vendor":"Red Hat","product":"Red Hat OpenShift AI (RHOAI)","defaultStatus":"unaffected","cpes":["cpe:/a:redhat:openshift_ai"]}]
[{"vendor":"Red Hat","product":"Red Hat Satellite 6.18","defaultStatus":"affected","cpes":["cpe:/a:redhat:satellite:6.18::el9"]},{"vendor":"Red Hat","product":"Red Hat OpenShift AI (RHOAI)","defaultStatus":"unaffected","cpes":["cpe:/a:redhat:openshift_ai"]}]
[{"vendor":"Red Hat","product":"Red Hat Satellite 6","defaultStatus":"affected","cpes":["cpe:/a:redhat:satellite:6"]},{"vendor":"Red Hat","product":"Red Hat OpenShift AI (RHOAI)","defaultStatus":"unaffected","cpes":["cpe:/a:redhat:openshift_ai"]}]
New CVE Received from GitHub, Inc.4/02/2026 11:16:38 AM
Action
Type
Old Value
New Value
Added
Description
FastMCP is a Pythonic way to build MCP servers and clients. Prior to version 3.2.0, the OpenAPIProvider in FastMCP exposes internal APIs to MCP clients by parsing OpenAPI specifications. The RequestDirector class is responsible for constructing HTTP requests to the backend service. A vulnerability exists in the _build_url() method. When an OpenAPI operation defines path parameters (e.g., /api/v1/users/{user_id}), the system directly substitutes parameter values into the URL template string without URL-encoding. Subsequently, urllib.parse.urljoin() resolves the final URL. Since urljoin() interprets ../ sequences as directory traversal, an attacker controlling a path parameter can perform path traversal attacks to escape the intended API prefix and access arbitrary backend endpoints. This results in authenticated SSRF, as requests are sent with the authorization headers configured in the MCP provider. This issue has been patched in version 3.2.0.
) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
