CVE-2026-19964 Jij-Inc Jij-MCP-Server jm_check python_repr.py PythonREPL.run code injection
Remote attackers can execute arbitrary code via the PythonREPL.run function in the Jij-MCP-Server library due to improper input validation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-19964?
CVE-2026-19964 is a medium-severity code injection vulnerability in Jij-Inc Jij-MCP-Server, published on 16 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A vulnerability was found in Jij-Inc Jij-MCP-Server 0.1.0. This affects the function PythonREPL.run of the file jij_mcp/python_repr.py of the component jm_check. The manipulation of the argument code results in code injection. It is possible to launch the attack remotely. The exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.
Which versions are affected by CVE-2026-19964?
How do I fix CVE-2026-19964?
No fix has been published for CVE-2026-19964 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-19964 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19964 exists.
Sources
Also known as GHSA-g33m-cxj9-5gvx.