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SCA: security update for github.com/github/github-mcp-server (GHSA-w4q6-qw23-4rg7)

high Tenable Self-Hosted Container Security Plugin ID 445408

Description

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

 - GitHub MCP Server is GitHub's official MCP Server. Prior to 1.1.0, the CompletionsHandler function in
 pkg/github/server.go accesses params.Ref without first checking whether it is nil, so a
 completion/complete request with a missing or empty ref field triggers a nil pointer dereference and a Go
 runtime panic; because the crash occurs before any authentication or token validation, any unauthenticated
 client able to send JSON-RPC messages can crash the server, resulting in a complete denial of service.
 This issue is fixed in version 1.1.0. (CVE-2026-47427)

Solution

Update the github.com/github/github-mcp-server library and its related packages to version 1.1.0 or later.

See Also

https://github.com/advisories/GHSA-w4q6-qw23-4rg7

Plugin Details

Severity: High

ID: 445408

Version: Revision 1.3

Type: Local

Family: SCA Checks

Published: 7/28/2026

Updated: 8/10/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.89

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

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

CVSS Score Source: CVE-2026-47427

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/28/2026

Vulnerability Publication Date: 7/28/2026

Reference Information

CVE: CVE-2026-47427

cwe: CWE-476