jupyter_core known bugs

### Impact _What kind of vulnerability is it? Who is impacted?_ We’d like to disclose an arbitrary code execution vulnerability in `jupyter_core` that stems from `jupyter_core` executing untrusted files in the current working directory. This vulnerability allows one user to run code as another. ### Patches _Has the problem been patched? What versions should users upgrade to?_ Users should upgrade to `jupyter_core>=4.11.2`. ### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_ No ### References _Are there any links users can visit to find out more?_ Similar advisory in [IPython](https://github.com/advisories/GHSA-pq7m-3gw7-gq5x)

## Impact On Windows, the shared `%PROGRAMDATA%` directory is searched for configuration files (`SYSTEM_CONFIG_PATH` and `SYSTEM_JUPYTER_PATH`), which may allow users to create configuration files affecting other users. Only shared Windows systems with multiple users and unprotected `%PROGRAMDATA%` are affected. ## Mitigations - upgrade to `jupyter_core>=5.8.1` (5.8.0 is patched but breaks `jupyter-server`) , or - as administrator, modify the permissions on the `%PROGRAMDATA%` directory so it is not writable by unauthorized users, or - as administrator, create the `%PROGRAMDATA%\jupyter` directory with appropriately restrictive permissions, or - as user or administrator, set the `%PROGRAMDATA%` environment variable to a directory with appropriately restrictive permissions (e.g. controlled by administrators _or_ the current user) ## Credit Reported via Trend Micro Zero Day Initiative as ZDI-CAN-25932

## Impact On Windows, the shared `%PROGRAMDATA%` directory is searched for configuration files (`SYSTEM_CONFIG_PATH` and `SYSTEM_JUPYTER_PATH`), which may allow users to create configuration files affecting other users. Only shared Windows systems with multiple users and unprotected `%PROGRAMDATA%` are affected. ## Mitigations - upgrade to `jupyter_core>=5.8.1` (5.8.0 is patched but breaks `jupyter-server`) , or - as administrator, modify the permissions on the `%PROGRAMDATA%` directory so it is not writable by unauthorized users, or - as administrator, create the `%PROGRAMDATA%\jupyter` directory with appropriately restrictive permissions, or - as user or administrator, set the `%PROGRAMDATA%` environment variable to a directory with appropriately restrictive permissions (e.g. controlled by administrators _or_ the current user) ## Credit Reported via Trend Micro Zero Day Initiative as ZDI-CAN-25932

Jupyter Core is a package for the core common functionality of Jupyter projects. Jupyter Core prior to version 4.11.2 contains an arbitrary code execution vulnerability in `jupyter_core` that stems from `jupyter_core` executing untrusted files in CWD. This vulnerability allows one user to run code as another. Version 4.11.2 contains a patch for this issue. There are no known workarounds.