UBUNTU-CVE-2026-42557

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Source

https://ubuntu.com/security/CVE-2026-42557

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42557.json

JSON Data

https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-42557

Upstream

CVE-2026-42557

Published

2026-05-13T16:16:00Z

Modified

2026-06-30T18:17:45.410865200Z

Severity

8.6 (High) CVSS_V4 - 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 CVSS Calculator
8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
9.6 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

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.

References

Affected packages

Ubuntu:25.10 / jupyterlab

Package

Name: jupyterlab
Purl: pkg:deb/ubuntu/jupyterlab?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.0.11+ds1+~cs11.25.27-5

4.0.11+ds1+~cs11.25.27-6

4.0.11+ds1+~cs11.25.27-7

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "4.0.11+ds1+~cs11.25.27-7",
            "binary_name": "jupyterlab"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42557.json"

Ubuntu:26.04:LTS / jupyterlab