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JupyterLab before 4.6.2 Authentication Bypass via PyPIExtensionManager

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

BIT-jupyterlab-2026-73626

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:BIT-jupyterlab-2026-73626

jupyterlab

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
4.5.10

Source reference: /affected/0/ranges

4.6.2

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.5.10"
          },
          {
            "introduced": "4.6.0"
          },
          {
            "fixed": "4.6.2"
          }
        ]
      }
    ],
    "package": {
      "name": "jupyterlab",
      "purl": "pkg:bitnami/jupyterlab",
      "ecosystem": "Bitnami"
    },
    "severity": [
      {
        "type": "CVSS_V4",
        "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
      }
    ],
    "database_specific": {
      "source": "https://github.com/bitnami/vulndb/tree/main/data/jupyterlab/BIT-jupyterlab-2026-73626.json"
    }
  }
]
Related CVEs
CVE-2026-73626

Source reference: /aliases

Publisher severity

high

Source reference: /database_specific/severity

Event
#15284 · Revision 1
Added to Heist Feed
Publisher date
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