CVE-2026-123854: Security vulnerability

Published Nov 6, 2026

Updated

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

Event History

Nov 6, 2026

CVE Published

via MITRE·04:10 PM

Data Sourced

via MITRE·04:10 PM

DescriptionSeverityWeakness

Data Sourced

via NVD·05:17 PM

DescriptionSeverityWeakness

Frequently Asked Questions

Which PyCharm versions are affected?

PyCharm versions before 2026.3 are affected.

Does running PyCharm in Safe Mode prevent exploitation?

No. Code execution was possible in Safe Mode through a crafted Jupyter notebook widget module.

What should be updated to remediate this issue?

Upgrade PyCharm to version 2026.3 or later.

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