CVE-2026-73626High· 7.5▾ TwilightJupyterLab 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/bloc…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 14.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.2%
0.2% → 0.2%
Last analysed / modified upstream
7.5 → 0
high → none
0 → 7.5
none → high
7.5 → 0
high → none
0 → 7.5
none → high
7.5 → 0
high → none
0 → 7.5
none → high
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
jupyterlab >= 4.6.0, < 4.6.2jupyterlab < 4.5.10Patched in:
jupyterlab 4.6.2jupyterlab 4.5.10Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
GHSA-whvh-wf3x-g77jLowJupyterLab: Allowlist/blocklist check in `PyPIExtensionManager.install()` not enforced for direct callers (missing `await`)
CVE-2026-73417High· 8.3jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture
CVE-2026-73416Mediumjupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture
GHSA-h5v5-8746-g7mmMediumJupyterLab PluginManager lock-rule enforcement bypass
GHSA-89vp-jrxv-24w8MediumJupyterLab: PyPI extension blocklist package-name canonicalization bypass
GHSA-gx64-gj6p-pc4cHighJupyterLab: Image viewer allows XSS when opening malicious image in new browser tab