CVE-2026-42266
⚠️ highSummary
JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.0.0 to 4.5.6, the allow-list of extensions that can be installed from PyPI Extension Manager (allowed_extensions_uris) is not correctly enforced by JupyterLab. The PyPI Extension Manager was not contained to packages listed on the default PyPI index. This vulnerability is fixed in 4.5.7.
CVSS Score
8.8
High
EPSS Score
0.0
Exploit Probability
Published Date
2026-05-13
First Seen: 2026-05-22
📊 Relative Risk Intelligence
This CVE is High Risk - more severe than 81.1% of all 328,009 vulnerabilities in our database.
#62,016
Top 25% most severe
Severity Percentile
🎯 CISA SSVC Assessment Updated: May 13, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Total
Complete system compromise possible
SSVC data provided by
CISA
Last Modified
2026-05-26
Source
NVD 🔗
CVSS Vector 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H