Vulnerability-Lookup

FKIE_CVE-2026-32871

Vulnerability from fkie_nvd - Published: 2026-04-02 15:16 - Updated: 2026-10-26 21:10

Severity

10.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
8.5 (High) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Summary

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.

References

URL	Tags
security-advisories@github.com	https://github.com/PrefectHQ/fastmcp/commit/40bdfb6b1de0ce30609ee9ba5bb95ecd04a9fb71	Patch
security-advisories@github.com	https://github.com/PrefectHQ/fastmcp/pull/3507	Issue Tracking, Patch
security-advisories@github.com	https://github.com/PrefectHQ/fastmcp/releases/tag/v3.2.0	Product, Release Notes
security-advisories@github.com	https://github.com/PrefectHQ/fastmcp/security/advisories/GHSA-vv7q-7jx5-f767	Exploit, Mitigation, Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:36350
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-32871
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2454434
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/PrefectHQ/fastmcp/security/advisories/GHSA-vv7q-7jx5-f767	Exploit, Mitigation, Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32871.json

Impacted products

	Vendor	Product	Version
	jlowin	fastmcp	*

JSON

To clipboard

{
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      "affectedData": [
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          "product": "fastmcp",
          "vendor": "PrefectHQ",
          "versions": [
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      "lang": "en",
      "value": "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."
    },
    {
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      "value": "FastMCP es una forma Pythonic de construir servidores y clientes MCP. Antes de la versi\u00f3n 3.2.0, el OpenAPIProvider en FastMCP expone APIs internas a clientes MCP al analizar especificaciones OpenAPI. La clase RequestDirector es responsable de construir solicitudes HTTP al servicio de backend. Existe una vulnerabilidad en el m\u00e9todo _build_url(). Cuando una operaci\u00f3n OpenAPI define par\u00e1metros de ruta (p. ej., /api/v1/users/{user_id}), el sistema sustituye directamente los valores de los par\u00e1metros en la cadena de la plantilla URL sin codificaci\u00f3n URL. Posteriormente, urllib.parse.urljoin() resuelve la URL final. Dado que urljoin() interpreta las secuencias .. /  como salto de directorio, un atacante que controla un par\u00e1metro de ruta puede realizar ataques de salto de ruta para escapar del prefijo de API previsto y acceder a puntos finales de backend arbitrarios. Esto resulta en SSRF autenticado, ya que las solicitudes se env\u00edan con los encabezados de autorizaci\u00f3n configurados en el proveedor MCP. Este problema ha sido parcheado en la versi\u00f3n 3.2.0."
    }
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  "lastModified": "2026-10-26T21:10:00.170",
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          "exploitMaturity": "NOT_DEFINED",
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          "modifiedAttackVector": "NOT_DEFINED",
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          "modifiedUserInteraction": "NOT_DEFINED",
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}

CVE-2026-32871 (GCVE-0-2026-32871)

Vulnerability from cvelistv5 – Published: 2026-04-02 14:52 – Updated: 2026-07-15 01:07

Title

FastMCP OpenAPI Provider has an SSRF & Path Traversal Vulnerability

Summary

Severity

10 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

8.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-02 15:59 UTC

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7994 records in the last 180 days details

References

8 references

URL	Tags
https://github.com/PrefectHQ/fastmcp/security/adv…	x_refsource_CONFIRM
https://github.com/PrefectHQ/fastmcp/pull/3507	x_refsource_MISC
https://github.com/PrefectHQ/fastmcp/commit/40bdf…	x_refsource_MISC
https://github.com/PrefectHQ/fastmcp/releases/tag…	x_refsource_MISC
https://access.redhat.com/security/cve/CVE-2026-32871	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2454434	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:36350	vendor-advisoryx_refsource_REDHAT

Impacted products

3 products

Vendor	Product	Version
PrefectHQ	fastmcp	Affected: < 3.2.0
Red Hat	Red Hat Satellite 6.18	Unaffected: 1782739344 , < * (rpm) cpe:/a:redhat:satellite:6.18::el9
Red Hat	Red Hat OpenShift AI (RHOAI)	cpe:/a:redhat:openshift_ai

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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