CVE-2026-55157

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.

CVSS 3.1

8.4CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.9% chance of exploitation in the next 30 days; higher than 58% of CVEs (scores of 2026-10-25)

CWE

CWE-78

Published

2026-09-28

Modified

2026-10-01

Record from

the NVD, synced 2026-10-19

Packages (OSV)

References

• https://github.com/ooples/token-optimizer-mcp/commit/b4ee96dac799cbfba0a9f9c17844ce9d613cbcc7
• https://github.com/ooples/token-optimizer-mcp/releases/tag/v5.1.0
• https://github.com/ooples/token-optimizer-mcp/security/advisories/GHSA-49mq-fc6q-3h46
• https://github.com/ooples/token-optimizer-mcp/security/advisories/GHSA-49mq-fc6q-3h46

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