Answer in brief
CVE-2026-55157 records a High severity (CVSS 8.4) vulnerability in Token Optimizer MCP: OS command injection in smart_user via username in get-user-info. The current sources do not mark it as known exploited. The current feed maps ooples/token-optimizer-mcp (generic), @ooples/token-optimizer-mcp (npm), @ooples/token-optimizer-mcp (npm). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps ooples/token-optimizer-mcp (generic), @ooples/token-optimizer-mcp (npm), @ooples/token-optimizer-mcp (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| ooples/token-optimizer-mcpgeneric | <5.1.0 | 5.1.0 |
| @ooples/token-optimizer-mcpnpm | <5.1.0 | 5.1.0 |
| @ooples/token-optimizer-mcpnpm | >=0 <5.1.0 | 5.1.0 |
Published upstream
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.