Detections
Analytics

SCA: security update for mcp (GHSA-9h52-p55h-vw2f)

high Tenable Self-Hosted Container Security Plugin ID 436181

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP).
 Prior to version 1.23.0, tThe 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 FastMCP with streamable HTTP or SSE transport, and has not configured
 TransportSecuritySettings, 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. This vulnerability is fixed in
 1.23.0. (CVE-2025-66416)

See Also

https://github.com/advisories/GHSA-9h52-p55h-vw2f

Plugin Details

Severity: High

ID: 436181

Version: Revision 1.10

Type: Local

Family: SCA Checks

Published: 12/2/2025

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.59

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2025-66416

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 7.6

Threat Score: 4.9

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 12/2/2025

Vulnerability Publication Date: 12/2/2025

Reference Information

CVE: CVE-2025-66416