jupyterlab — security advisory

{
  "id": "d0939769cb07858c13400a89aefe2471dbba2518b2f30abc862600ffd82f2806",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-73626",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-73626",
    "summary": "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.",
    "evidence": "osv:UBUNTU-CVE-2026-73626",
    "products": [
      {
        "name": {
          "value": "jupyterlab",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.0.11+ds1+~cs11.25.27-9",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "jupyterlab",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.0.11+ds1+~cs11.25.27-7",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "4.0.11+ds1+~cs11.25.27-8",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "4.0.11+ds1+~cs11.25.27-9",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-73626",
      "aliases": [
        "UBUNTU-CVE-2026-73626"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
        },
        {
          "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"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "jupyterlab",
            "purl": "pkg:deb/ubuntu/jupyterlab?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "4.0.11+ds1+~cs11.25.27-9",
            "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3",
            "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73626.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "jupyterlab",
                "binary_version": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "jupyterlab",
            "purl": "pkg:deb/ubuntu/jupyterlab?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "4.0.11+ds1+~cs11.25.27-7",
            "4.0.11+ds1+~cs11.25.27-8",
            "4.0.11+ds1+~cs11.25.27-9"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73626.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "jupyterlab",
                "binary_version": "4.0.11+ds1+~cs11.25.27-9"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T13:01:04.071388931Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-73626"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-73626",
        "https://www.cve.org/CVERecord?id=CVE-2026-73626",
        "https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-whvh-wf3x-g77j",
        "https://www.vulncheck.com/advisories/jupyterlab-before-authentication-bypass-via-pypiextensionmanager"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-73626",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/1/score"
  },
  "source_id": "core-osv",
  "document_id": 360926,
  "published_at": "2026-08-13T12:17:00+00:00"
}