Answer in brief
CVE-2026-73417 records a High severity vulnerability in JupyterLab: Cross-site scripting (XSS) via crafted settings file (`overrides.json`). The current sources do not mark it as known exploited. The current feed maps jupyterlab/jupyterlab (generic), jupyterlab (pip), jupyterlab (pip), jupyterlab (pypi) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-73417 records a High severity vulnerability in JupyterLab: Cross-site scripting (XSS) via crafted settings file (`overrides.json`). The current sources do not mark it as known exploited. The current feed maps jupyterlab/jupyterlab (generic), jupyterlab (pip), jupyterlab (pip), jupyterlab (pypi) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps jupyterlab/jupyterlab (generic), jupyterlab (pip), jupyterlab (pip), jupyterlab (pypi) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| jupyterlab/jupyterlabgeneric | >= 3.3.0, < 4.5.10 || >= 4.6.0, < 4.6.2 | Not reported |
| jupyterlabpip | >=4.6.0,<=4.6.1 | 4.6.2 |
| jupyterlabpip | >=3.3.0,<=4.5.9 | 4.5.10 |
| jupyterlabpypi | >=4.6.0 <4.6.2 | 4.6.2 |
| jupyterlabpypi | >=3.3.0 <4.5.10 | 4.5.10 |
Published upstream
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 8, 2026
jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 3.3.0 until 4.5.10 and 4.6.2, JupyterLab allows notebook settings to be shared and applied through an overrides.json file using the Import button in the Settings Editor. In packages/notebook-extension/schema/tracker.json and packages/notebook-extension/src/index.ts, the sideBySideLeftMarginOverride and sideBySideRightMarginOverride settings are not properly validated before being inserted into style content, allowing a crafted settings file to contain instructions that execute as code instead of only changing display preferences. A user can import the malicious file, or an attacker with access to a shared settings location can plant an overrides.json that is applied automatically. The embedded code runs with the affected user's access and can read or modify notebooks and files and run code through the notebook server, including on a connected kernel. This issue is fixed in versions 4.5.10 and 4.6.2.
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps jupyterlab/jupyterlab (generic), jupyterlab (pip), jupyterlab (pip), jupyterlab (pypi) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| jupyterlab/jupyterlabgeneric | >= 3.3.0, < 4.5.10 || >= 4.6.0, < 4.6.2 | Not reported |
| jupyterlabpip | >=4.6.0,<=4.6.1 | 4.6.2 |
| jupyterlabpip | >=3.3.0,<=4.5.9 | 4.5.10 |
| jupyterlabpypi | >=4.6.0 <4.6.2 | 4.6.2 |
| jupyterlabpypi | >=3.3.0 <4.5.10 | 4.5.10 |
Published upstream
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 8, 2026
jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 3.3.0 until 4.5.10 and 4.6.2, JupyterLab allows notebook settings to be shared and applied through an overrides.json file using the Import button in the Settings Editor. In packages/notebook-extension/schema/tracker.json and packages/notebook-extension/src/index.ts, the sideBySideLeftMarginOverride and sideBySideRightMarginOverride settings are not properly validated before being inserted into style content, allowing a crafted settings file to contain instructions that execute as code instead of only changing display preferences. A user can import the malicious file, or an attacker with access to a shared settings location can plant an overrides.json that is applied automatically. The embedded code runs with the affected user's access and can read or modify notebooks and files and run code through the notebook server, including on a connected kernel. This issue is fixed in versions 4.5.10 and 4.6.2.
Quoted source text, attributed separately from HOL analysis.