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SCA: security update for github.com/googleapis/mcp-toolbox (GHSA-7pf3-8xx7-rvhf)

critical Tenable Cloud Security Plugin ID 444291

Description

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

 - Vulnerable to DNS rebinding attacks when using SSE (http://b/499408790). During the beta phase, we
 implemented `allowed-origins` and `allowed-hosts` flags to align with MCP security guidelines. However,
 the hardcoded `Access-Control-Allow-Origin: *` header in the SSE initialization handler was inadvertently
 retained. This vulnerability specifically impacts users connecting via Toolbox using SSE under
 specification v2024-11-05. (CVE-2026-9739)

Solution

Update the github.com/googleapis/mcp-toolbox library and its related packages to version 1.2.0 or later.

See Also

https://github.com/advisories/GHSA-7pf3-8xx7-rvhf

Plugin Details

Severity: Critical

ID: 444291

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 7/2/2026

Updated: 7/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.03

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2026-9739

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.4

Threat Score: 7.6

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/28/2026

Vulnerability Publication Date: 5/27/2026

Reference Information

CVE: CVE-2026-9739

cwe: CWE-942