---
id: CVE-2026-55157
title: >-
  Token Optimizer MCP measures token savings per AI coding agent, optimizes
  context, and shares a live local knowledge graph across 16 CLI clients
summary: >-
  Token Optimizer MCP measures token savings per AI coding agent, optimizes
  context, and shares a live local knowledge graph across 16 CLI clients. Prior
  to version 5.1.0, token-optimizer-mcp is vulnerable to OS command injection in
  the sm…
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-78
vendor: ooples
product: token-optimizer-mcp
affected:
  - token-optimizer-mcp < 5.1.0
patched:
  - '@ooples/token-optimizer-mcp 5.1.0'
published: '2026-09-28'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T15:17:30.207'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55157'
references:
  - url: >-
      https://github.com/ooples/token-optimizer-mcp/commit/b4ee96dac799cbfba0a9f9c17844ce9d613cbcc7
    label: security-advisories@github.com
  - url: 'https://github.com/ooples/token-optimizer-mcp/releases/tag/v5.1.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/ooples/token-optimizer-mcp/security/advisories/GHSA-49mq-fc6q-3h46
    label: security-advisories@github.com
  - url: >-
      https://github.com/ooples/token-optimizer-mcp/security/advisories/GHSA-49mq-fc6q-3h46
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-49mq-fc6q-3h46'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - npm
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-01T14:47:18.746481Z'
epss: 0.00881
epssPercentile: 0.58931
aliases:
  - GHSA-49mq-fc6q-3h46
ecosystem: npm
ingestedAt: '2026-08-14T22:21:25.769Z'
---

## Overview

Token Optimizer MCP measures token savings per AI coding agent, optimizes context, and shares a live local knowledge graph across 16 CLI clients. Prior to version 5.1.0, token-optimizer-mcp is vulnerable to OS command injection in the smart_user tool. Any MCP client that can call the smart_user tool can execute arbitrary shell commands through the username argument of the get-user-info operation. The commands execute with the privileges of the user running the token-optimizer-mcp server. This issue has been patched in version 5.1.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55157)

Affected packages:

- `@ooples/token-optimizer-mcp < 5.1.0`

Patched in:

- `@ooples/token-optimizer-mcp 5.1.0`

Source: https://github.com/advisories/GHSA-49mq-fc6q-3h46