Is jupyterlab affected by CVE-2026-42557?

PyPI jupyterlab is affected in <4.5.7.

Is CVE-2026-42557 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

high

CVE-2026-42557

Q: Is CVE-2026-42557 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

PyPI · jupyterlab • PyPI · notebook

Summary

JupyterLab's command linker attributes in HTML enable one-click command execution from untrusted content

Severity: high
EPSS: 0.3% (p25)
Also known as: GHSA-mqcg-5x36-vfcg#jupyterlab, GHSA-mqcg-5x36-vfcg#notebook, BIT-jupyter-base-notebook-2026-42557, BIT-jupyter-notebook-2026-42557, BIT-jupyterlab-2026-42557
Published: 2026-05-06

References

https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-mqcg-5x36-vfcg
https://nvd.nist.gov/vuln/detail/CVE-2026-42557
https://github.com/jupyterlab/jupyterlab

Related advisories

CVE-2026-42266 — high · PyPI/jupyterlab
CVE-2026-40171 — high · PyPI/jupyterlab
GHSA-vmhf-c436-hxj4 — medium · PyPI/jupyterlab

Is your project exposed to this? Stateward checks every dependency on every pull request and flags it only if your code actually reaches it.

Check my repo

Summarize with AI

ChatGPT Claude Perplexity

Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.