CVE-2026-42557
high
CVSS v3
—
CVSS v2
—
VIR risk
8.0
Description
JupyterLab's command linker attributes in HTML enable one-click command execution from untrusted content
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-42557
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | forky | affected | |
| debian | sid | affected | |
| debian | trixie | affected | |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| PyPI | jupyterlab | <4.5.7 | 4.5.7 |
| PyPI | notebook | >=7.0.0,<7.5.6 | 7.5.6 |
| PIP | notebook | >= 7.0.0, <= 7.5.5 | 7.5.6 |
| PIP | jupyterlab | <= 4.5.6 | 4.5.7 |
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
- https://jupyterlab.readthedocs.io/en/latest/user/commands.html#commands-in-markdown-files
- https://security-tracker.debian.org/tracker/CVE-2026-42557
- https://github.com/advisories/GHSA-mqcg-5x36-vfcg
CWEs
CWE-79
Verify integrity in audit chain (admin only). AS-IS.