{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "4.6.0"
              },
              {
                "fixed": "4.6.1"
              },
              {
                "introduced": "0"
              },
              {
                "fixed": "4.5.10"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "604d873f61b50ef6c3fadc048e05291cb09a7890"
            },
            {
              "fixed": "665f9b7f77fb6d720d9cfa76c38fdd1d9823cd07"
            },
            {
              "introduced": "0"
            },
            {
              "fixed": "af5f5b3c779f6d7170c1124f5818807fa18f3f63"
            }
          ],
          "repo": "https://github.com/jupyterlab/jupyterlab",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-whvh-wf3x-g77j"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-284"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73626.json"
  },
  "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.",
  "id": "CVE-2026-73626",
  "modified": "2026-08-15T11:30:53.429393509Z",
  "published": "2026-08-13T11:28:25.551Z",
  "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"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "JupyterLab before 4.6.2 Authentication Bypass via PyPIExtensionManager"
}