{"id":"DEBIAN-CVE-2026-73626","details":"JupyterLab versions \u003e=4.6.0,\u003c=4.6.1 and \u003c=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.","modified":"2026-09-10T09:00:57.615242207Z","published":"2026-08-13T12:17:27.897Z","upstream":["CVE-2026-73626"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-73626"}],"affected":[{"package":{"name":"jupyterlab","ecosystem":"Debian:13","purl":"pkg:deb/debian/jupyterlab?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.11+ds1+~cs11.25.27-7","4.0.11+ds1+~cs11.25.27-8","4.0.11+ds1+~cs11.25.27-9","4.0.11+ds2+~cs11.25.27-1","4.0.11+ds2+~cs11.25.27-3","4.0.11+ds3+~cs11.25.27-1","4.0.11+ds4+~cs11.25.27-1","4.0.11+ds4+~cs11.25.27-2","4.0.11+ds4+~cs11.25.27-3","4.0.11+ds4+~cs11.25.27-4","4.0.11+ds5+~cs11.25.27-1","4.0.13+ds1+~2.0.1+~cs1.4.4-1","4.1.3+ds1+~2.0.1+~0.15.3+~cs1.4.4-1","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-1","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-2","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-3","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-4","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-5","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-6","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-7","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-8","4.4.1+ds1+~3.0.5+~0.16.6+~cs1.4.4-1","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-1","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-2","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-5","4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-73626.json"}},{"package":{"name":"jupyterlab","ecosystem":"Debian:14","purl":"pkg:deb/debian/jupyterlab?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4"}]}],"versions":["4.0.11+ds1+~cs11.25.27-7","4.0.11+ds1+~cs11.25.27-8","4.0.11+ds1+~cs11.25.27-9","4.0.11+ds2+~cs11.25.27-1","4.0.11+ds2+~cs11.25.27-3","4.0.11+ds3+~cs11.25.27-1","4.0.11+ds4+~cs11.25.27-1","4.0.11+ds4+~cs11.25.27-2","4.0.11+ds4+~cs11.25.27-3","4.0.11+ds4+~cs11.25.27-4","4.0.11+ds5+~cs11.25.27-1","4.0.13+ds1+~2.0.1+~cs1.4.4-1","4.1.3+ds1+~2.0.1+~0.15.3+~cs1.4.4-1","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-1","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-2","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-3","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-4","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-5","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-6","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-7","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-8","4.4.1+ds1+~3.0.5+~0.16.6+~cs1.4.4-1","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-1","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-2","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3","4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-73626.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}