{"schemaVersion":3,"id":"CVE-2026-73626","aliases":["GHSA-whvh-wf3x-g77j","BIT-jupyterlab-2026-73626","UBUNTU-CVE-2026-73626","DEBIAN-CVE-2026-73626"],"status":"published","duplicateOf":null,"title":null,"description":"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. 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