CVE-2026-73416
published 2026-08-13CVE-2026-73416: jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.5.0 until 4.5.10 and…
PriorityP342medium6.1CVSS 4.0
AVNACLATPPRLUINVCLVIHVALSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.66%
51.2th percentile
jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.5.0 until 4.5.10 and 4.6.2, in jupyterlab/extensions/manager.py and jupyterlab/extensions/pypi.py, JupyterLab's PyPI extension manager enforces blocked_extensions_uris by comparing requested install names to blocklist entries with custom normalization that is weaker than PyPI package-name canonicalization. An authenticated user can request a PyPI-equivalent spelling such as JupyterLab.Git for a blocklisted package such as jupyterlab-git, and JupyterLab accepts the install request even though pip resolves the variant to the same package. Security impact requires an allowlist or blocklist intended to restrict package installation, the PyPI Extension Manager, and kernels and terminals that are disabled or delegated to remote hosts. The bypass lets an authenticated user install a prohibited extension, defeat integrity restrictions, and affect availability without gaining new read access. This issue is fixed in versions 4.5.10 and 4.6.2.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| jupyterlab | jupyterlab | — | — |
| jupyterlab | jupyterlab | — | — |
CVSS provenance
nvdv4.06.1MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat6.1MEDIUM
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VulDB
JupyterLab up to 4.5.9/4.6.1 PyPI Extension Manager manager.py privileges management
vuldb·2026-08-14·CVSS 6.1
CVE-2026-73416 [MEDIUM] JupyterLab up to 4.5.9/4.6.1 PyPI Extension Manager manager.py privileges management
A vulnerability was found in JupyterLab up to 4.5.9/4.6.1 and classified as problematic. This issue affects some unknown processing of the file jupyterlab/extensions/manager.py of the component PyPI Extension Manager. Executing a manipulation can lead to improper privilege management.
This vulnerability is tracked as CVE-2026-73416. The attack can be launched remotely. No exploit exists.
It is suggested to upgrade the affected component.
Red Hat
jupyterlab: jupyterlab: Extension blocklist bypass via weak package-name canonicalization
vendor_redhat·2026-08-13·CVSS 6.1
CVE-2026-73416 [MEDIUM] CWE-1289 jupyterlab: jupyterlab: Extension blocklist bypass via weak package-name canonicalization
jupyterlab: jupyterlab: Extension blocklist bypass via weak package-name canonicalization
A flaw was found in jupyterlab. The PyPI (Python Package Index) extension manager uses a custom normalization process for package names that is weaker than the official PyPI canonicalization. This allows an authenticated user to bypass blocklist restrictions by using an alternative spelling of a prohibited package name. Consequently, an attacker can install unauthorized extensions, compromise system integrity, and impact the availability of the JupyterLab environment.
No detection rules found.
No public exploits indexed.
https://github.com/jupyterlab/jupyterlab/commit/9365f020baec5221deaf11535ed554c06637c999https://github.com/jupyterlab/jupyterlab/commit/be9303f5bcd5308eaeae953c5a3c903046682c2chttps://github.com/jupyterlab/jupyterlab/commit/f1beab4a2027af4719d6edc07d52d6cf5a39a432https://github.com/jupyterlab/jupyterlab/pull/19184https://github.com/jupyterlab/jupyterlab/pull/19185https://github.com/jupyterlab/jupyterlab/pull/19186https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.10https://github.com/jupyterlab/jupyterlab/releases/tag/v4.6.2https://github.com/jupyterlab/jupyterlab/releases/tag/v4.7.0a1https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-89vp-jrxv-24w8
2026-08-13
Published