CVE-2015-7337 is a critical-severity (CVSS 9.8) Improper Input Validation vulnerability in notebook. A fix is available for notebook — see the affected versions and patch details below.
Improper Input Validation in Jupyter Notebook
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
notebook🐍ipythonReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
The editor in IPython Notebook before 3.2.2 and Jupyter Notebook 4.0.x before 4.0.5 allows remote attackers to execute arbitrary JavaScript code via a crafted file, which triggers a redirect to files/, related to MIME types.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | notebook | ≥ 4.0.0&&< 4.0.5 | 4.0.5pip install --upgrade 'notebook==4.0.5' |
| 🐍PyPI | ipython | all versions | 3.2.2pip install --upgrade 'ipython==3.2.2' |
Affected Products
notebookipythonnotebookjupyterDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for notebook, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update notebook to 4.0.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2015-7337 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Frequently Asked Questions
Is CVE-2015-7337 in your dependencies?
Find it across PyPI, including transitive dependencies.