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PYSEC-2026-1477
jupyter-coreImpact
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 breaksjupyter-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%\jupyterdirectory 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
The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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