Upsonic: remote code execution vulnerability in its MCP server/task creation functionality
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | upsonic | < 0.72.0 | 0.72.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-30625
- https://github.com/Upsonic/Upsonic/commit/855053fce0662227d9246268ff4a0844b481a305
- https://github.com/Upsonic/Upsonic
- https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem
- https://pypi.org/project/upsonic
- https://github.com/advisories/GHSA-cw73-5f7h-m4gv
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-77- Platform
- Python (PyPI)
- Package
upsonic- Disclosed
- 15.04.2026
- Updated
- 11.10.2026 13:17
Sources and licenses
OSV / GitHub Advisory Database - GHSA-cw73-5f7h-m4gv - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-559 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: upsonic
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 06.2025 04.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
- High 1
Disclosures per year
- 2025: 2
- 2026: 1
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