# mcp (PyPI) vulnerabilities Source: https://junglewise.ai/threats/technologies/pypi-mcp Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/pypi-mcp.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 10 vulnerabilities in mcp (PyPI): 0 in the last 7 days and 4 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-116686, was published on 27 October 2026. 4 vulnerabilities in the last four weeks, up from none in the four before. ## Counts - Last 7 days: 0 - Last 30 days: 4 - Last 90 days: 4 - All time: 10 (0 critical, 0 exploited in the wild) ## About mcp (PyPI) Model Context Protocol implementation for tool and resource integration. ## Latest mcp (PyPI) vulnerabilities - [CVE-2026-116686: Model Context Protocol Python SDK unvalidated $ref fetching](https://junglewise.ai/threats/cve-2026-116686-the-model-context-protocol-python-sdk-is-the-official-python-sdk) (medium, CVSS 6.5, published 27 Oct 2026) - [CVE-2026-116685: Model Context Protocol Python SDK credential and body leak on cross-origin redirects](https://junglewise.ai/threats/cve-2026-116685-the-model-context-protocol-python-sdk-is-the-official-python-sdk) (medium, CVSS 5.9, published 27 Oct 2026) - [CVE-2026-116684: Model Context Protocol Python SDK token resource confusion in bearer authentication](https://junglewise.ai/threats/cve-2026-116684-the-model-context-protocol-python-sdk-is-the-official-python-sdk) (medium, CVSS 6.8, published 27 Oct 2026) - [CVE-2026-59951: MCP Python SDK unbounded session accumulation in StreamableHTTP](https://junglewise.ai/threats/cve-2026-59951-mcp-python-sdk-unbounded-session-accumulation-in-streamablehttp) (high, CVSS 7.5, published 14 Oct 2026) - [CVE-2026-59950: modelcontextprotocol python-sdk missing origin validation in WebSocket transport](https://junglewise.ai/threats/cve-2026-59950-modelcontextprotocol-python-sdk-missing-origin-validation-in) (high, CVSS 4, published 15 Jul 2026) - [CVE-2026-52870: Model Context Protocol Python SDK missing authorization in experimental tasks](https://junglewise.ai/threats/cve-2026-52870-model-context-protocol-python-sdk-missing-authorization-in) (high, CVSS 7.6, published 15 Jul 2026) - [CVE-2026-52869: modelcontextprotocol mcp authorization bypass in SSE and HTTP transports](https://junglewise.ai/threats/cve-2026-52869-modelcontextprotocol-mcp-authorization-bypass-in-sse-and-http) (high, CVSS 7.1, published 15 Jul 2026) - [CVE-2025-66416: Model Context Protocol Python SDK DNS rebinding in HTTP servers](https://junglewise.ai/threats/cve-2025-66416-model-context-protocol-python-sdk-dns-rebinding-in-http-servers) (high, CVSS 8.1, published 2 Dec 2025) - [CVE-2025-53366: Model Context Protocol Python SDK DoS in FastMCP Server](https://junglewise.ai/threats/cve-2025-53366-model-context-protocol-python-sdk-dos-in-fastmcp-server) (high, CVSS 4, published 4 Jul 2025) - [CVE-2025-53365: Model Context Protocol Python SDK denial of service in HTTP transport](https://junglewise.ai/threats/cve-2025-53365-model-context-protocol-python-sdk-denial-of-service-in-http) (high, CVSS 4, published 4 Jul 2025) ## Most severe mcp (PyPI) vulnerabilities - [CVE-2025-66416: Model Context Protocol Python SDK DNS rebinding in HTTP servers](https://junglewise.ai/threats/cve-2025-66416-model-context-protocol-python-sdk-dns-rebinding-in-http-servers) (high, CVSS 8.1, published 2 Dec 2025) - [CVE-2026-52870: Model Context Protocol Python SDK missing authorization in experimental tasks](https://junglewise.ai/threats/cve-2026-52870-model-context-protocol-python-sdk-missing-authorization-in) (high, CVSS 7.6, published 15 Jul 2026) - [CVE-2026-59951: MCP Python SDK unbounded session accumulation in StreamableHTTP](https://junglewise.ai/threats/cve-2026-59951-mcp-python-sdk-unbounded-session-accumulation-in-streamablehttp) (high, CVSS 7.5, published 14 Oct 2026) - [CVE-2026-52869: modelcontextprotocol mcp authorization bypass in SSE and HTTP transports](https://junglewise.ai/threats/cve-2026-52869-modelcontextprotocol-mcp-authorization-bypass-in-sse-and-http) (high, CVSS 7.1, published 15 Jul 2026) - [CVE-2025-53366: Model Context Protocol Python SDK DoS in FastMCP Server](https://junglewise.ai/threats/cve-2025-53366-model-context-protocol-python-sdk-dos-in-fastmcp-server) (high, CVSS 4, published 4 Jul 2025) - [CVE-2025-53365: Model Context Protocol Python SDK denial of service in HTTP transport](https://junglewise.ai/threats/cve-2025-53365-model-context-protocol-python-sdk-denial-of-service-in-http) (high, CVSS 4, published 4 Jul 2025) - [CVE-2026-59950: modelcontextprotocol python-sdk missing origin validation in WebSocket transport](https://junglewise.ai/threats/cve-2026-59950-modelcontextprotocol-python-sdk-missing-origin-validation-in) (high, CVSS 4, published 15 Jul 2026) - [CVE-2026-116684: Model Context Protocol Python SDK token resource confusion in bearer authentication](https://junglewise.ai/threats/cve-2026-116684-the-model-context-protocol-python-sdk-is-the-official-python-sdk) (medium, CVSS 6.8, published 27 Oct 2026) - [CVE-2026-116686: Model Context Protocol Python SDK unvalidated $ref fetching](https://junglewise.ai/threats/cve-2026-116686-the-model-context-protocol-python-sdk-is-the-official-python-sdk) (medium, CVSS 6.5, published 27 Oct 2026) - [CVE-2026-116685: Model Context Protocol Python SDK credential and body leak on cross-origin redirects](https://junglewise.ai/threats/cve-2026-116685-the-model-context-protocol-python-sdk-is-the-official-python-sdk) (medium, CVSS 5.9, published 27 Oct 2026) ## Vulnerabilities per week 4 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 | 1 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 3 | 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, "mcp (PyPI) vulnerabilities", https://junglewise.ai/threats/technologies/pypi-mcp, 13 November 2026.