# fastmcp (PyPI) vulnerabilities Source: https://junglewise.ai/threats/technologies/fastmcp Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/fastmcp.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 10 vulnerabilities in fastmcp (PyPI): 0 in the last 7 days and 2 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, FastMCP post-transform component authorization bypass, was published on 23 October 2026. 2 vulnerabilities in the last four weeks, up from none in the four before. ## Counts - Last 7 days: 0 - Last 30 days: 2 - Last 90 days: 2 - All time: 10 (1 critical, 0 exploited in the wild) ## About fastmcp (PyPI) fastmcp is a Python library for building Model Context Protocol servers with minimal boilerplate code. ## Latest fastmcp (PyPI) vulnerabilities - [FastMCP post-transform component authorization bypass](https://junglewise.ai/threats/fastmcp-post-transform-component-authorization-is-skipped-on-direct-a9992939) (medium, CVSS 6.8, published 23 Oct 2026) - [FastMCP OAuth provider missing issuer binding in M2M credential exchange](https://junglewise.ai/threats/fastmcp-mcp-client-wrappers-construct-m2m-oauth-providers-without-af21ca1f) (medium, CVSS 5.9, published 23 Oct 2026) - [CVE-2026-27124: FastMCP confused deputy vulnerability in OAuthProxy callback](https://junglewise.ai/threats/cve-2026-27124-fastmcp-confused-deputy-vulnerability-in-oauthproxy-callback) (medium, CVSS 6.1, published 3 Apr 2026) - [CVE-2025-64340: PrefectHQ FastMCP command injection in CLI install on Windows](https://junglewise.ai/threats/cve-2025-64340-prefecthq-fastmcp-command-injection-in-cli-install-on-windows) (medium, CVSS 6.7, published 3 Apr 2026) - [CVE-2026-32871: PrefectHQ FastMCP path traversal and SSRF in OpenAPIProvider](https://junglewise.ai/threats/cve-2026-32871-prefecthq-fastmcp-path-traversal-and-ssrf-in-openapiprovider) (critical, CVSS 10, published 2 Apr 2026) - [CVE-2025-69196: PrefectHQ FastMCP improper resource handling in OAuth Proxy](https://junglewise.ai/threats/cve-2025-69196-prefecthq-fastmcp-improper-resource-handling-in-oauth-proxy) (medium, CVSS 6.5, published 16 Mar 2026) - [FastMCP updated to MCP 1.23+ due to](https://junglewise.ai/threats/fastmcp-updated-to-mcp-1-23-due-to-2a534038) (info, published 26 Dec 2025) - [FastMCP Auth Integration Allows for Confused Deputy Account Takeover](https://junglewise.ai/threats/fastmcp-auth-integration-allows-for-confused-deputy-account-takeover-06227c41) (medium, CVSS 4, published 29 Oct 2025) - [CVE-2025-62801: PYSEC-2026-1365 - FastMCP vulnerable to windows command injection in FastMCP Cursor installer via server_name](https://junglewise.ai/threats/cve-2025-62801-fastmcp-vulnerable-to-windows-command-injection-in-fastmcp-cursor) (high, CVSS 7.8, published 28 Oct 2025) - [CVE-2025-62800: PYSEC-2026-1364 - FastMCP vulnerable to reflected XSS in client's callback page](https://junglewise.ai/threats/cve-2025-62800-fastmcp-vulnerable-to-reflected-xss-in-client-s-callback-page) (medium, CVSS 6.1, published 28 Oct 2025) ## Most severe fastmcp (PyPI) vulnerabilities - [CVE-2026-32871: PrefectHQ FastMCP path traversal and SSRF in OpenAPIProvider](https://junglewise.ai/threats/cve-2026-32871-prefecthq-fastmcp-path-traversal-and-ssrf-in-openapiprovider) (critical, CVSS 10, published 2 Apr 2026) - [CVE-2025-62801: PYSEC-2026-1365 - FastMCP vulnerable to windows command injection in FastMCP Cursor installer via server_name](https://junglewise.ai/threats/cve-2025-62801-fastmcp-vulnerable-to-windows-command-injection-in-fastmcp-cursor) (high, CVSS 7.8, published 28 Oct 2025) - [FastMCP post-transform component authorization bypass](https://junglewise.ai/threats/fastmcp-post-transform-component-authorization-is-skipped-on-direct-a9992939) (medium, CVSS 6.8, published 23 Oct 2026) - [CVE-2025-64340: PrefectHQ FastMCP command injection in CLI install on Windows](https://junglewise.ai/threats/cve-2025-64340-prefecthq-fastmcp-command-injection-in-cli-install-on-windows) (medium, CVSS 6.7, published 3 Apr 2026) - [CVE-2025-69196: PrefectHQ FastMCP improper resource handling in OAuth Proxy](https://junglewise.ai/threats/cve-2025-69196-prefecthq-fastmcp-improper-resource-handling-in-oauth-proxy) (medium, CVSS 6.5, published 16 Mar 2026) - [CVE-2026-27124: FastMCP confused deputy vulnerability in OAuthProxy callback](https://junglewise.ai/threats/cve-2026-27124-fastmcp-confused-deputy-vulnerability-in-oauthproxy-callback) (medium, CVSS 6.1, published 3 Apr 2026) - [CVE-2025-62800: PYSEC-2026-1364 - FastMCP vulnerable to reflected XSS in client's callback page](https://junglewise.ai/threats/cve-2025-62800-fastmcp-vulnerable-to-reflected-xss-in-client-s-callback-page) (medium, CVSS 6.1, published 28 Oct 2025) - [FastMCP OAuth provider missing issuer binding in M2M credential exchange](https://junglewise.ai/threats/fastmcp-mcp-client-wrappers-construct-m2m-oauth-providers-without-af21ca1f) (medium, CVSS 5.9, published 23 Oct 2026) - [FastMCP Auth Integration Allows for Confused Deputy Account Takeover](https://junglewise.ai/threats/fastmcp-auth-integration-allows-for-confused-deputy-account-takeover-06227c41) (medium, CVSS 4, published 29 Oct 2025) - [FastMCP updated to MCP 1.23+ due to](https://junglewise.ai/threats/fastmcp-updated-to-mcp-1-23-due-to-2a534038) (info, published 26 Dec 2025) ## Vulnerabilities per week 2 vulnerabilities in the last four weeks, up from none in the four before. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 2 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other PyPI technologies - [tensorflow (PyPI)](https://junglewise.ai/threats/technologies/pypi-tensorflow): 435 vulnerabilities - [tensorflow-cpu (PyPI)](https://junglewise.ai/threats/technologies/tensorflow-cpu): 430 vulnerabilities - [tensorflow-gpu (PyPI)](https://junglewise.ai/threats/technologies/tensorflow-gpu): 427 vulnerabilities - [open-webui (PyPI)](https://junglewise.ai/threats/technologies/open-webui): 177 vulnerabilities - [Django (PyPI)](https://junglewise.ai/threats/technologies/django): 173 vulnerabilities - [apache-airflow (PyPI)](https://junglewise.ai/threats/technologies/apache-airflow): 159 vulnerabilities - [pillow (PyPI)](https://junglewise.ai/threats/technologies/pillow): 125 vulnerabilities - [praisonai (PyPI)](https://junglewise.ai/threats/technologies/pypi-praisonai): 120 vulnerabilities - [vllm (PyPI)](https://junglewise.ai/threats/technologies/pypi-vllm): 117 vulnerabilities - [plone (PyPI)](https://junglewise.ai/threats/technologies/pypi-plone): 101 vulnerabilities - [mlflow (PyPI)](https://junglewise.ai/threats/technologies/mlflow): 88 vulnerabilities - [picklescan (PyPI)](https://junglewise.ai/threats/technologies/picklescan): 86 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "fastmcp (PyPI) vulnerabilities", https://junglewise.ai/threats/technologies/fastmcp, 13 November 2026.