---
id: CVE-2026-123854
title: >-
  In JetBrains PyCharm before 2026.3 code execution was possible in Safe Mode
  via a crafted Jupyter notebook widget module
summary: >-
  In JetBrains PyCharm before 2026.3 code execution was possible in Safe Mode
  via a crafted Jupyter notebook widget module
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-829
vendor: JetBrains
product: PyCharm
affected:
  - PyCharm < 2026.3
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:42:06.986892Z'
published: '2026-11-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:46:29.111Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-123854'
references:
  - url: 'https://www.jetbrains.com/privacy-security/issues-fixed/'
tags:
  - cve.org
ingestedAt: '2026-11-06T16:57:43.129Z'
---

## Overview

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

## Affected

- `PyCharm < 2026.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.