GitHub Advisoryadvisory · PyPI

GHSA-cw73-5f7h-m4gv Upsonic: remote code execution vulnerability in its MCP server/task creation functionality

CRITICAL Published 2026-04-15 Modified 2026-04-16 Official page ↗
Aliases
CVE-2026-30625
Ecosystem
PyPI
Packages
upsonic
Severity
Critical
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-77
Reviewed
2026-04-16

Affected packages

• PyPI upsonic: < 0.72.0 → fixed in 0.72.0

Description

Upsonic 0.71.6 contains a remote code execution vulnerability in its MCP server/task creation functionality. The application allows users to define MCP tasks with arbitrary command and args values. Although an allowlist exists, certain allowed commands (npm, npx) accept argument flags that enable execution of arbitrary OS commands. Maliciously crafted MCP tasks may lead to remote code execution with the privileges of the Upsonic process. In version 0.72.0 Upsonic added a warning about using Stdio servers being able to execute commands directly on the machine.

Related

Alias · CVE (1)

  • CVE-2026-30625 Upsonic 0.71.6 contains a remote code execution vulnerability in its MCP server/task creation functionality. vulnerability

Weakness · CWE (1)

  • CWE-77 Improper Neutralization of Special Elements used in a Command weakness

References