jupyterlab — security advisory

{
  "id": "867c3254226e48d01aca4fd1d2cb4a51380c8f73ba4086d80d0b42e494219a79",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-42557",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-42557",
    "summary": "jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all click events on document.body and executes the named command without checking whether the element came from trusted JupyterLab UI. A notebook with a pre-saved HTML cell output containing a deceptive button can trigger arbitrary JupyterLab commands - including arbitrary code execution - on a single user click, without any code being submitted for execution by the user. This vulnerability is fixed in 4.5.7.",
    "evidence": "osv:UBUNTU-CVE-2026-42557",
    "products": [
      {
        "name": {
          "value": "jupyterlab",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.0.11+ds1+~cs11.25.27-5",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.0.11+ds1+~cs11.25.27-6",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.0.11+ds1+~cs11.25.27-7",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "jupyterlab",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.0.11+ds1+~cs11.25.27-9",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "jupyterlab",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.0.11+ds1+~cs11.25.27-7",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "4.0.11+ds1+~cs11.25.27-8",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "4.0.11+ds1+~cs11.25.27-9",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "UBUNTU-CVE-2026-42557",
      "aliases": [
        "UBUNTU-CVE-2026-42557"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        },
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        },
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "jupyterlab",
            "purl": "pkg:deb/ubuntu/jupyterlab?arch=source&distro=questing",
            "ecosystem": "Ubuntu:25.10"
          },
          "versions": [
            "4.0.11+ds1+~cs11.25.27-5",
            "4.0.11+ds1+~cs11.25.27-6",
            "4.0.11+ds1+~cs11.25.27-7"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42557.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "jupyterlab",
                "binary_version": "4.0.11+ds1+~cs11.25.27-7"
              }
            ]
          }
        },
        {
          "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-2026-42557.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-2026-42557.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "jupyterlab",
                "binary_version": "4.0.11+ds1+~cs11.25.27-9"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T13:00:05.594899186Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-42557"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-42557",
        "https://www.cve.org/CVERecord?id=CVE-2026-42557",
        "https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-mqcg-5x36-vfcg"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-42557",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/2/score"
  },
  "source_id": "core-osv",
  "document_id": 360311,
  "published_at": "2026-05-13T16:16:00+00:00"
}