Detections
Analytics

SCA: security update for mcp (GHSA-qvqr-5cv7-wh35)

high Tenable Cloud Security Plugin ID 439486

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 version
 0.9.2, the Ruby SDK's streamable_http_transport.rb implementation contains a session hijacking
 vulnerability. An attacker who obtains a valid session ID can completely hijack the victim's Server-Sent
 Events (SSE) stream and intercept all real-time data. Version 0.9.2 contains a patch. (CVE-2026-33946)

Solution

Update the mcp library and its related packages to version 0.9.2 or later.

See Also

https://github.com/advisories/GHSA-qvqr-5cv7-wh35

Plugin Details

Severity: High

ID: 439486

Version: Revision 1.3

Type: Local

Family: SCA Checks

Published: 3/31/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4.2

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

CVSS Score Source: CVE-2026-33946

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.3

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

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

CVSS v4

Risk Factor: High

Base Score: 8.2

Threat Score: 6.9

Threat Vector: CVSS:4.0/E:P

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/27/2026

Vulnerability Publication Date: 3/27/2026

Reference Information

CVE: CVE-2026-33946