{"cve":"CVE-2026-73416","nvd":{"published":"2026-08-13T22:17:25.963","modified":"2026-09-18T20:05:53.723","status":"Awaiting Analysis","description":"jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.5.0 until 4.5.10 and 4.6.2, in jupyterlab/extensions/manager.py and jupyterlab/extensions/pypi.py, JupyterLab's PyPI extension manager enforces blocked_extensions_uris by comparing requested install names to blocklist entries with custom normalization that is weaker than PyPI package-name canonicalization. An authenticated user can request a PyPI-equivalent spelling such as JupyterLab.Git for a blocklisted package such as jupyterlab-git, and JupyterLab accepts the install request even though pip resolves the variant to the same package. Security impact requires an allowlist or blocklist intended to restrict package installation, the PyPI Extension Manager, and kernels and terminals that are disabled or delegated to remote hosts. The bypass lets an authenticated user install a prohibited extension, defeat integrity restrictions, and affect availability without gaining new read access. This issue is fixed in versions 4.5.10 and 4.6.2.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N","score":6.1},"cvss_v3":null,"cwes":["CWE-178","CWE-180"],"references":["https://github.com/jupyterlab/jupyterlab/commit/9365f020baec5221deaf11535ed554c06637c999","https://github.com/jupyterlab/jupyterlab/commit/be9303f5bcd5308eaeae953c5a3c903046682c2c","https://github.com/jupyterlab/jupyterlab/commit/f1beab4a2027af4719d6edc07d52d6cf5a39a432","https://github.com/jupyterlab/jupyterlab/pull/19184","https://github.com/jupyterlab/jupyterlab/pull/19185"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:48:17.459049833+00:00"},"epss":{"cve":"CVE-2026-73416","score":0.00664,"percentile":0.51753,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-89vp-jrxv-24w8","url":"https://osv.dev/vulnerability/GHSA-89vp-jrxv-24w8","summary":"JupyterLab: PyPI extension blocklist package-name canonicalization bypass","modified":"2026-09-10T03:51:10.924466137Z","packages":[{"ecosystem":"PyPI","name":"jupyterlab","purl":"pkg:pypi/jupyterlab","ranges":[">=4.6.0 <4.6.2"],"fixed":["4.6.2"]},{"ecosystem":"PyPI","name":"jupyterlab","purl":"pkg:pypi/jupyterlab","ranges":[">=4.5.0 <4.5.10"],"fixed":["4.5.10"]}]},{"id":"PYSEC-2026-3670","url":"https://osv.dev/vulnerability/PYSEC-2026-3670","summary":"JupyterLab: PyPI extension blocklist package-name canonicalization bypass","modified":"2026-08-19T12:55:56.163961998Z","packages":[{"ecosystem":"PyPI","name":"jupyterlab","purl":"pkg:pypi/jupyterlab","ranges":[">=4.5.0 <4.5.10",">=4.6.0 <4.6.2"],"fixed":["4.5.10","4.6.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}