{"id":"CVE-2026-73626","aliases":["GHSA-whvh-wf3x-g77j"],"url":"https://o3.security/vulnerability/CVE-2026-73626","summary":"JupyterLab before 4.6.2 Authentication Bypass via PyPIExtensionManager","details":"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.","published":"2026-08-13T11:28:25.551Z","modified":"2026-08-15T11:30:53.429393509Z","cvss":null,"epss":{"score":0.00181,"percentile":0.07713,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"jupyterlab","fixedVersion":"4.6.2"},{"ecosystem":"PyPI","name":"jupyterlab","fixedVersion":"4.5.10"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73626.json"},{"type":"ADVISORY","url":"https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-whvh-wf3x-g77j"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73626"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/jupyterlab-before-authentication-bypass-via-pypiextensionmanager"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-15T11:30:53.429393509Z"}}