Detections
Analytics

SCA: security update for mcp (GHSA-rjr6-rcgv-9m7m)

medium Tenable Cloud Security Plugin ID 445485

Description

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

 - MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients. Prior to 0.23.0,
 MCP::Server::Transports::StreamableHTTPTransport in the mcp gem does not validate the HTTP Host or Origin
 request headers, which allows a malicious browser page to use DNS rebinding to reach a locally running MCP
 server and invoke exposed tools. This issue is fixed in version 0.23.0. (CVE-2026-63118)

Solution

Update the mcp library and its related packages to version 0.23.0 or later.

See Also

https://github.com/advisories/GHSA-rjr6-rcgv-9m7m

Plugin Details

Severity: Medium

ID: 445485

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 7/30/2026

Updated: 7/30/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.63

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2026-63118

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 3.6

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 7/30/2026

Vulnerability Publication Date: 7/29/2026

Reference Information

CVE: CVE-2026-63118