Detections
Analytics
SCA: security update for github.com/modelcontextprotocol/go-sdk (GHSA-xw59-hvm2-8pj6)
high Tenable Self-Hosted Container Security Plugin ID 439672
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 1.4.0, the Model Context Protocol (MCP)
Go 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 with StreamableHTTPHandler or SSEHandler, 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. This issue has been patched in version 1.4.0.
(CVE-2026-34742)
Solution
Update the github.com/modelcontextprotocol/go-sdk library and its related packages to version 1.4.0 or later.See Also
Plugin Details
Severity: High
ID: 439672
Version: Revision 1.7
Type: Local
Family: SCA Checks
Published: 4/2/2026
Updated: 7/2/2026
Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security
Risk Information
VPR
Risk Factor: Medium
Score: 6.3
Percentile: 96.77
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-2026-34742
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: 4/1/2026
Vulnerability Publication Date: 4/1/2026
Reference Information
CVE: CVE-2026-34742
cwe: CWE-1188