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SCA: security update for github.com/modelcontextprotocol/go-sdk (GHSA-89xv-2j6f-qhc8)

medium Tenable Self-Hosted Container Security Plugin ID 439243

Description

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

 - The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.1, the Go SDK's Streamable HTTP
 transport accepted browser-generated cross-site `POST` requests without validating the `Origin` header and
 without requiring `Content-Type: application/json`. In deployments without Authorization, especially
 stateless or sessionless configurations, this allows an arbitrary website to send MCP requests to a local
 server and potentially trigger tool execution. Version 1.4.1 contains a patch for the issue.
 (CVE-2026-33252)

Solution

Update the github.com/modelcontextprotocol/go-sdk library and its related packages to version 1.4.1 or later.

See Also

https://github.com/advisories/GHSA-89xv-2j6f-qhc8

Plugin Details

Severity: Medium

ID: 439243

Version: Revision 1.6

Type: Local

Family: SCA Checks

Published: 3/26/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 94.39

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-33252

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 3/19/2026

Vulnerability Publication Date: 3/19/2026

Reference Information

CVE: CVE-2026-33252

cwe: CWE-352