Bug 2415005

Summary:	CVE-2025-59840 jupyterlab: Cross-Site Scripting (XSS) via expressions abusing toString calls in environments using the VEGA_DEBUG global variable [fedora-43]
Product:	[Fedora] Fedora	Reporter:	TEJ RATHI <trathi>
Component:	jupyterlab	Assignee:	Lumír Balhar <lbalhar>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	43	CC:	lbalhar, python-packagers-sig, romain.geissler
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["10f995b7-30d0-4168-98d4-f6953a90c0e4"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-06-14 14:44:00 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2414907

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.