Improper input validation in jupyterlab
Priority MEDIUM 49CWE-602Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 2 fixed, 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-88.
Summary
JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.0.0 to 4.5.6, the allow-list of extensions that can be installed from PyPI Extension Manager (allowed_extensions_uris) is not correctly enforced by JupyterLab. The PyPI Extension Manager was not contained to packages listed on the default PyPI index. This vulnerability is fixed in 4.5.7.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.05652 93rd percentileScored 2026-11-07
Fix Partial jupyterlab (jupyterlab): 4.5.7jupyterlab (PyPI): 4.5.7Red Hat: 2 advisoriesRed Hat: 2 fixed, 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| jupyterlab | jupyterlab | 4.0.0 to before 4.5.7 | 4.5.7 | Patch available | CNA |
| — | jupyterlab (PyPI) | 4.0.0 to before 4.5.7 | 4.5.7 | Patch available | GHSA-37w4-hwhx-4rc4 |
- jupyterlab Vendorjupyterlab Affected 4.0.0 to before 4.5.7 Fixed in 4.5.7 Patch available CNA
- jupyterlab (PyPI) Vendor— Affected 4.0.0 to before 4.5.7 Fixed in 4.5.7 Patch available GHSA-37w4-hwhx-4rc4
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:jupyter:jupyterlab:*:*:*:*:*:*:*:* | 4.0.0 to before 4.5.7 | Vulnerable | jupyterlab |
- cpe:2.3:a:jupyter:jupyterlab:*:*:*:*:*:*:*:* Versions 4.0.0 to before 4.5.7 Vulnerable ·jupyterlab
Remediation
- Fix · CNA jupyterlab (jupyterlab) Fixed in 4.5.7
- Fix · GHSA-37w4-hwhx-4rc4 jupyterlab (PyPI) Fixed in 4.5.7 Advisory →
Red Hat 2 advisories
- RHSA-2026:60520 Released 2026-08-27 · Red Hat rating CriticalRHOAI 3.4.4 - Red Hat OpenShift AI
- Red Hat OpenShift AI 3.4 registry.redhat.io/rhoai/odh-automl-rhel9, registry.redhat.io/rhoai/odh-autorag-rhel9, registry.redhat.io/rhoai/odh-built-in-detector-rhel9 +47
- RHSA-2026:43038 Released 2026-07-21 · Red Hat rating CriticalMigration Toolkit for Applications
- Red Hat Migration Toolkit for Applications 8.2 registry.redhat.io/mta/mta-cli-rhel9, registry.redhat.io/mta/mta-solution-server-rhel9
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet |
| Red Hat Migration Toolkit for Applications 8.2 | Fixed | RHSA-2026:43038 |
| Red Hat OpenShift AI 3.4 | Fixed | RHSA-2026:60520 |
Not affected: 3 products
- Red Hat Migration Toolkit for Applications 8.2
- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift AI 3.4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-42266
- 2026-10-03 Alias added: GHSA-37w4-hwhx-4rc4
- 2026-10-25 EPSS moved to the 90th–95th percentile
References
Advisory 2
Other 4
More Jupyterlab vulnerabilities
- TI-2024-26623 Remote Code Execution (RCE) vulnerability in jupyterlab extension template `update-integration-tests` GitHub Action CVSS 3.1CRITICAL 10.0
- TI-2021-12463 JupyterLab: XSS due to lack of sanitization of the action attribute of an html <form> CVSS 3.1CRITICAL 9.6
- TI-2026-30837 jupyterlab: Command linker attributes in HTML enable one-click command execution from untrusted content CVSS 4.0HIGH 8.6
- TI-2024-14994 Potential authentication and CSRF tokens leak in JupyterLab CVSS 3.1HIGH 7.6
- TI-2024-29399 HTML injection in Jupyter Notebook and JupyterLab leading to DOM Clobbering CVSS 3.1HIGH 7.6
- TI-2024-14993 Stored cross site scripting in Markdown Preview in JupyterLab CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-42266 · CVE Program
- CVE-2026-42266 · NVD
- FIRST EPSS
- GHSA-37w4-hwhx-4rc4 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-42266 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences