Upsonic: remote code execution vulnerability in its MCP server/task creation functionality

CRITICAL 9.8CVE-2026-30625 · GHSA-cw73-5f7h-m4gv · PYSEC-2026-559 · Published 15/04/2026 · updated 17/06/2026

Package	Affected versions	Patched versions
upsonic PyPI	`< 0.72.0`	`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.

NVD description

References

nvd.nist.gov/vuln/detail/CVE-2026-30625 · ADVISORY
Upsonic/Upsonic commit 855053f · WEB
Upsonic/Upsonic · PACKAGE
ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem · WEB
ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem
pypi.org/project/upsonic · PACKAGE
GitHub Advisory GHSA-cw73-5f7h-m4gv · ADVISORY

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Package

Affected versions

Patched versions

upsonic

PyPI

< 0.72.0

0.72.0

Description

NVD description