Bug 2515249 (CVE-2026-73626) - CVE-2026-73626 jupyterlab: JupyterLab: Extension allowlist bypass allows unauthorized installations
Summary: CVE-2026-73626 jupyterlab: JupyterLab: Extension allowlist bypass allows unau...
Keywords:
Status: NEW
Alias: CVE-2026-73626
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-13 11:53 UTC by OSIDB Bzimport
Modified: 2026-08-19 15:40 UTC (History)
1 user (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-08-13 11:53:51 UTC
JupyterLab versions >=4.6.0,<=4.6.1 and <=4.5.9 contain an allowlist/blocklist enforcement gap in PyPIExtensionManager.install(). A missing 'await' caused the is_install_allowed coroutine to never execute, so the extension allowlist/blocklist check was not enforced for direct callers of install(). The stock JupyterLab HTTP API and Extension Manager UI are not affected, as they perform a separate, correctly awaited check. The issue affects only deployments where a custom extension or downstream integration imports PyPIExtensionManager and calls install() directly with a package name influenced by untrusted input, an allowlist/blocklist is configured, the PyPI Extension Manager is enabled, and kernels and terminals are disabled or delegated to remote hosts. Fixed in JupyterLab 4.6.2 and 4.5.10.


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