Bug 2415005 - CVE-2025-59840 jupyterlab: Cross-Site Scripting (XSS) via expressions abusing toString calls in environments using the VEGA_DEBUG global variable [fedora-43]
Summary: CVE-2025-59840 jupyterlab: Cross-Site Scripting (XSS) via expressions abusing...
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Fedora
Classification: Fedora
Component: jupyterlab
Version: 43
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Lumír Balhar
QA Contact:
URL:
Whiteboard: {"flaws": ["10f995b7-30d0-4168-98d4-f...
Depends On:
Blocks: CVE-2025-59840
TreeView+ depends on / blocked
 
Reported: 2025-11-14 09:47 UTC by TEJ RATHI
Modified: 2026-06-14 14:44 UTC (History)
3 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2026-06-14 14:44:00 UTC
Type: ---
Embargoed:

Attachments (Terms of Use)

Description TEJ RATHI 2025-11-14 09:47:42 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Comment 1 Lumír Balhar 2025-11-20 09:43:34 UTC 
Upstream issue: https://github.com/jupyterlab/jupyterlab/issues/18113
Comment 2 Lumír Balhar 2026-06-14 14:44:00 UTC 
This vulnerability requires window.VEGA_DEBUG or window.vega to be set globally. JupyterLab's webpack build loads vega inside module scope with no global exposure. Confirmed absent from the production static bundle. Not exploitable.
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