{"id":"GHSA-whvh-wf3x-g77j","summary":"JupyterLab: Allowlist/blocklist check in `PyPIExtensionManager.install()` not enforced for direct callers (missing `await`)","details":"The extension allowlist/blocklist check inside `PyPIExtensionManager.install()` was not enforced due to a missing await. For purposes of JupyterLab this was a secondary defense-in-depth check: `install()` was intended to enforce the allowlist/blocklist itself for any future uses and users calling this method directly (in addition to the separate check handling requests arriving through the HTTP API).  The only runtime symptom was a `RuntimeWarning: coroutine 'is_install_allowed' was never awaited.`\n\nThis has security implications only for deployments that combine all of the following:\n- a custom extension or downstream integration that imports `PyPIExtensionManager` and calls `install()` directly with a package name influenced by untrusted user input (the stock JupyterLab HTTP handler is not affected - it performs its own awaited allowlist check before calling `install()`);\n- an allowlist/blocklist configured with the intent of restricting which packages users can install;\n- the (default) PyPI Extension Manager enabled; and\n- kernels and terminals disabled or delegated to remote hosts, so that the custom extension's `install()` call is the only available package-install vector (otherwise a user with kernel access can install packages directly regardless of this check)\n\n### Impact\n\nLow. No exposure for stock JupyterLab: the HTTP API and Extension Manager UI enforce the listing through a separate, correctly awaited check. The gap affected only custom extensions or downstream integrations that called the public `install()` method directly and relied on it to self-enforce.\n\n### Patches\n\nJupyterLab [`v4.6.2`](https://github.com/jupyterlab/jupyterlab/releases/tag/v4.6.2) and [`v4.5.10`](https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.10) contain the patch.\n\nUsers of applications that depend on JupyterLab, such as Notebook v7+, should update `jupyterlab` package too.\n\n### Workarounds\n\nNo action is required for deployments that only expose extension management through the JupyterLab HTTP API / Extension Manager UI, as that path was already enforcing the listing via the handler's own check. Deployments wanting to disable programmatic extension installation entirely can switch to the read-only extension manager:\n\n```bash\n--LabApp.extension_manager=readonly\n```\n\nor the following traitlet:\n\n```python\nc.LabApp.extension_manager = 'readonly'\n```\n\nYou can confirm that the read-only manager is in use from GUI:\n\n\u003cimg width=\"293\" height=\"293\" alt=\"image\" src=\"https://github.com/user-attachments/assets/8016c809-633e-4ed0-a5bc-6bc4793caa0f\" /\u003e","aliases":["BIT-jupyterlab-2026-73626","CVE-2026-73626"],"modified":"2026-09-25T14:25:48.030827903Z","published":"2026-07-22T23:12:22Z","database_specific":{"nvd_published_at":null,"cwe_ids":["CWE-284","CWE-636"],"severity":"LOW","github_reviewed":true,"github_reviewed_at":"2026-07-22T23:12:22Z"},"references":[{"type":"WEB","url":"https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-whvh-wf3x-g77j"},{"type":"WEB","url":"https://github.com/jupyterlab/jupyterlab/pull/19184"},{"type":"WEB","url":"https://github.com/jupyterlab/jupyterlab/pull/19185"},{"type":"WEB","url":"https://github.com/jupyterlab/jupyterlab/pull/19186"},{"type":"WEB","url":"https://github.com/jupyterlab/jupyterlab/commit/be9303f5bcd5308eaeae953c5a3c903046682c2c"},{"type":"WEB","url":"https://github.com/jupyterlab/jupyterlab/commit/f1beab4a2027af4719d6edc07d52d6cf5a39a432"},{"type":"PACKAGE","url":"https://github.com/jupyterlab/jupyterlab"},{"type":"WEB","url":"https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.10"},{"type":"WEB","url":"https://github.com/jupyterlab/jupyterlab/releases/tag/v4.6.2"}],"affected":[{"package":{"name":"jupyterlab","ecosystem":"PyPI","purl":"pkg:pypi/jupyterlab"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.6.0"},{"fixed":"4.6.2"}]}],"versions":["4.6.0","4.6.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-whvh-wf3x-g77j/GHSA-whvh-wf3x-g77j.json","last_known_affected_version_range":"\u003c= 4.6.1"}},{"package":{"name":"jupyterlab","ecosystem":"PyPI","purl":"pkg:pypi/jupyterlab"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.5.10"}]}],"versions":["0.0.1","0.0.10","0.0.13","0.0.2","0.0.3","0.0.4","0.0.5","0.0.6","0.0.7","0.0.8","0.0.9","0.1.1","0.1.2","0.10.0","0.11.0","0.11.1","0.11.2","0.11.3","0.12.0","0.12.1","0.13.0","0.13.1","0.13.2","0.14.0","0.15.0","0.15.1","0.16.0","0.16.2","0.17.0","0.17.1","0.17.2","0.17.4","0.17.5","0.18.0","0.18.0.dev1","0.18.1","0.19.0","0.2.0","0.20.0","0.20.0rc1","0.20.1","0.20.2","0.20.3","0.20.4","0.21.0","0.21.0rc1","0.21.0rc2","0.21.0rc3","0.21.0rc4","0.21.0rc5","0.22.0","0.22.0rc0","0.22.1","0.23.0","0.23.0rc0","0.23.0rc1","0.23.1","0.23.2","0.24.0","0.24.0rc0","0.24.0rc1","0.24.0rc2","0.24.1","0.25.0","0.25.0rc0","0.25.0rc1","0.25.1","0.25.2","0.25.2rc0","0.26.0","0.26.0rc0","0.26.0rc1","0.26.1","0.26.2","0.26.3","0.26.4","0.26.5","0.27.0","0.27.0rc0","0.27.0rc1","0.27.0rc2","0.27.0rc3","0.27.0rc4","0.27.0rc5","0.27.1","0.27.2","0.28.0","0.28.0rc0","0.28.0rc1","0.28.0rc2","0.28.0rc3","0.28.1","0.28.10","0.28.11","0.28.12","0.28.13","0.28.14","0.28.15","0.28.2","0.28.3","0.28.4","0.28.5","0.28.6","0.28.7","0.28.8","0.29.0","0.29.0rc0","0.29.1","0.29.2","0.3.0","0.30.0","0.30.0rc0","0.30.0rc1","0.30.1","0.30.2","0.30.3","0.30.4","0.30.5","0.30.6","0.31.0","0.31.0rc0","0.31.0rc1","0.31.0rc2","0.31.1","0.31.10","0.31.11","0.31.12","0.31.2","0.31.3","0.31.4","0.31.5","0.31.6","0.31.7","0.31.8","0.31.9","0.32.0","0.32.0rc0","0.32.0rc1","0.32.1","0.33.0","0.33.0rc0","0.33.0rc1","0.33.1","0.33.10","0.33.11","0.33.12","0.33.2","0.33.3","0.33.4","0.33.5","0.33.6","0.33.7","0.33.8","0.33.9","0.34.0","0.34.0rc0","0.34.0rc1","0.34.0rc2","0.34.1","0.34.10","0.34.11","0.34.12","0.34.2","0.34.3","0.34.4","0.34.5","0.34.6","0.34.7","0.34.8","0.34.9","0.35.0","0.35.0rc0","0.35.0rc1","0.35.0rc2","0.35.1","0.35.2","0.35.3","0.35.4","0.35.5","0.35.6","0.4.0","0.4.1","0.5.0","0.6.0","0.7.0","0.8.0","0.9.0","0.9.1","1.0.0","1.0.0a0","1.0.0a1","1.0.0a10","1.0.0a2","1.0.0a3","1.0.0a4","1.0.0a5","1.0.0a6","1.0.0a7","1.0.0a8","1.0.0a9","1.0.0rc0","1.0.0rc1","1.0.1","1.0.10","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6","1.0.7","1.0.9","1.1.0","1.1.0a0","1.1.0a1","1.1.0a2","1.1.0rc0","1.1.1","1.1.2","1.1.3","1.1.4","1.1.5","1.2.0","1.2.0a0","1.2.0a1","1.2.0a2","1.2.0a3","1.2.0rc0","1.2.1","1.2.10","1.2.11","1.2.12","1.2.13","1.2.14","1.2.15","1.2.16","1.2.17","1.2.18","1.2.19","1.2.2","1.2.20","1.2.21","1.2.3","1.2.4","1.2.5","1.2.6","1.2.7","1.2.8","1.2.9","2.0.0","2.0.0a0","2.0.0a1","2.0.0a3","2.0.0a4","2.0.0b1","2.0.0b2","2.0.0b3","2.0.0rc0","2.0.0rc1","2.0.0rc2","2.0.1","2.0.1rc0","2.0.2","2.1.0","2.1.0a0","2.1.0b0","2.1.0rc0","2.1.1","2.1.2","2.1.3","2.1.4","2.1.5","2.2.0","2.2.0a0","2.2.0a1","2.2.0rc1","2.2.1","2.2.10","2.2.2","2.2.4","2.2.5","2.2.6","2.2.7","2.2.8","2.2.9","2.3.0","2.3.0a0","2.3.0a1","2.3.0a2","2.3.0rc0","2.3.1","2.3.2","3.0.0","3.0.0a0","3.0.0a10","3.0.0a11","3.0.0a12","3.0.0a13","3.0.0a14","3.0.0a3","3.0.0a4","3.0.0a5","3.0.0a6","3.0.0a7","3.0.0a8","3.0.0a9","3.0.0b1","3.0.0b2","3.0.0b3","3.0.0b4","3.0.0b6","3.0.0b7","3.0.0b8","3.0.0rc0","3.0.0rc1","3.0.0rc10","3.0.0rc11","3.0.0rc12","3.0.0rc13","3.0.0rc14","3.0.0rc15","3.0.0rc2","3.0.0rc3","3.0.0rc4","3.0.0rc5","3.0.0rc6","3.0.0rc7","3.0.0rc8","3.0.0rc9","3.0.1","3.0.10","3.0.11","3.0.12","3.0.13","3.0.14","3.0.15","3.0.16","3.0.17","3.0.18","3.0.2","3.0.3","3.0.4","3.0.5","3.0.6","3.0.7","3.0.8","3.0.9","3.1.0","3.1.0a0","3.1.0a1","3.1.0a10","3.1.0a11","3.1.0a12","3.1.0a13","3.1.0a2","3.1.0a3","3.1.0a4","3.1.0a5","3.1.0a6","3.1.0a7","3.1.0a8","3.1.0a9","3.1.0b0","3.1.0b1","3.1.0rc1","3.1.0rc2","3.1.1","3.1.10","3.1.11","3.1.12","3.1.13","3.1.14","3.1.16","3.1.17","3.1.18","3.1.19","3.1.2","3.1.4","3.1.6","3.1.7","3.1.8","3.1.9","3.2.0","3.2.0a0","3.2.0a1","3.2.0b0","3.2.0rc0","3.2.1","3.2.2","3.2.3","3.2.4","3.2.5","3.2.6","3.2.7","3.2.8","3.2.9","3.3.0","3.3.0a1","3.3.0a2","3.3.0a3","3.3.0b0","3.3.0rc0","3.3.1","3.3.2","3.3.3","3.3.4","3.4.0","3.4.0a0","3.4.0b0","3.4.0rc0","3.4.1","3.4.2","3.4.3","3.4.4","3.4.5","3.4.6","3.4.7","3.4.8","3.5.0","3.5.0a0","3.5.0b0","3.5.0rc0","3.5.1","3.5.2","3.5.3","3.6.0","3.6.0a0","3.6.0a1","3.6.0a2","3.6.0a3","3.6.0a4","3.6.0a5","3.6.0b0","3.6.0rc0","3.6.0rc1","3.6.1","3.6.2","3.6.3","3.6.4","3.6.5","3.6.6","3.6.7","3.6.8","4.0.0","4.0.0a0","4.0.0a1","4.0.0a10","4.0.0a11","4.0.0a12","4.0.0a13","4.0.0a14","4.0.0a15","4.0.0a16","4.0.0a17","4.0.0a18","4.0.0a19","4.0.0a20","4.0.0a21","4.0.0a22","4.0.0a23","4.0.0a24","4.0.0a25","4.0.0a26","4.0.0a27","4.0.0a28","4.0.0a29","4.0.0a3","4.0.0a30","4.0.0a31","4.0.0a32","4.0.0a33","4.0.0a34","4.0.0a35","4.0.0a36","4.0.0a4","4.0.0a6","4.0.0a7","4.0.0a8","4.0.0a9","4.0.0b0","4.0.0b1","4.0.0b2","4.0.0rc0","4.0.0rc1","4.0.1","4.0.10","4.0.11","4.0.12","4.0.13","4.0.2","4.0.3","4.0.4","4.0.5","4.0.6","4.0.7","4.0.8","4.0.9","4.1.0","4.1.0a1","4.1.0a2","4.1.0a3","4.1.0a4","4.1.0b0","4.1.0b1","4.1.0b2","4.1.0rc0","4.1.0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