CVE-2026-30625 Upsonic: remote code execution vulnerability in its MCP server/task creation functionality
Attackers can execute arbitrary OS commands via crafted MCP tasks in Upsonic due to insufficient validation of allowed command arguments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-30625?
CVE-2026-30625 is a critical command injection vulnerability in n/a, published on 15 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-77
Which versions are affected by CVE-2026-30625?
3 open source packages ship an affected version, including upsonic.
| Package | Affected | Fixed in |
|---|---|---|
upsonic PyPI | All versions | 0.72.0 |
upsonic PyPI | All versions | 0.72.0 |
upsonic PyPI | All versions | 0.72.0 |
How do I fix CVE-2026-30625?
Upgrade upsonic to 0.72.0 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-30625 being exploited?
There is no known exploitation of CVE-2026-30625 in the wild and no public exploit code.
Sources
Also known as GHSA-cw73-5f7h-m4gv, PYSEC-2026-559.