Medium [CVE-2026-73416] Extension blocklist bypass via weak package-name canonicalization
This medium-severity Red Hat Linux advisory covers CVE-2026-73416 affecting Migration Toolkit for Applications 8, Red Hat OpenShift AI (RHOAI).
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Summary
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. 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.
Affected products named by the advisory: Migration Toolkit for Applications 8; Red Hat OpenShift AI (RHOAI).
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 29 days ago·verify at source
- 4.5.10
- 4.6.2
- 4.7.0
Official advisory · high-confidence parse· fetched 29 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 29 days ago·verify at source
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