{"apiVersion":"1.0","identifier":"CVE-2026-73626","description":"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.","publishedAt":"2026-08-13T12:17:27","lastModifiedAt":"2026-08-28T16:18:24","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73626","cvssScore":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00181,"riskScore":0.76,"affectedProduct":"JupyterLab","affectedVersions":">=4.6.0,<=4.6.1,<=4.5.9","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-73626","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-73626","en":"https://www.redsauce.net/en/cves/CVE-2026-73626","fr":"https://www.redsauce.net/fr/cves/CVE-2026-73626","pt":"https://www.redsauce.net/pt/cves/CVE-2026-73626","de":"https://www.redsauce.net/de/cves/CVE-2026-73626","sk":"https://www.redsauce.net/sk/cves/CVE-2026-73626","el":"https://www.redsauce.net/el/cves/CVE-2026-73626"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-73626"}}