CVE-2026-123854
Received Received - Intake

Code Execution in JetBrains PyCharm via Jupyter Notebook Widget

Publication date: 2026-11-06

Last updated on: 2026-11-06

Assigner: JetBrains s.r.o.

Description
In JetBrains PyCharm before 2026.3 code execution was possible in Safe Mode via a crafted Jupyter notebook widget module

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Meta Information

Published
2026-11-06
Last Modified
2026-11-06
Generated
2026-11-06
AI Q&A
2026-11-06
EPSS Evaluated
N/A
NVD
CVE-2026-123854
EUVD
EUVD-2026-118314

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
JetBrains PyCharm From 0 (inc) to 2026.3 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-829 The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.

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Executive Summary

In JetBrains PyCharm before version 2026.3, a vulnerability allows code execution in Safe Mode through a specially crafted Jupyter notebook widget module. Safe Mode is designed to restrict potentially harmful actions, but this flaw bypasses those restrictions.

Impact Analysis

This vulnerability could allow an attacker to execute arbitrary code on your system even when PyCharm is running in Safe Mode. This might lead to unauthorized access, data theft, or system compromise if exploited.

Mitigation Strategies

Update JetBrains PyCharm to version 2026.3 or later to address the vulnerability. Avoid using Safe Mode with untrusted Jupyter notebooks or widgets.

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