Vulnerability Description
NiceGUI is a Python-based UI framework. Prior to 3.7.0, NiceGUI's FileUpload.name property exposes client-supplied filename metadata without sanitization, enabling path traversal when developers use the pattern UPLOAD_DIR / file.name. Malicious filenames containing ../ sequences allow attackers to write files outside intended directories, with potential for remote code execution through application file overwrites in vulnerable deployment patterns. This design creates a prevalent security footgun affecting applications following common community patterns. Note: Exploitation requires application code incorporating file.name into filesystem paths without sanitization. Applications using fixed paths, generated filenames, or explicit sanitization are not affected. This vulnerability is fixed in 3.7.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zauberzeug | Nicegui | < 3.7.0 |
Related Weaknesses (CWE)
References
- https://github.com/zauberzeug/nicegui/blob/main/nicegui/elements/upload_files.pyPatch
- https://github.com/zauberzeug/nicegui/blob/main/nicegui/elements/upload_files.pyPatch
- https://github.com/zauberzeug/nicegui/security/advisories/GHSA-9ffm-fxg3-xrhhExploitMitigationVendor Advisory
FAQ
What is CVE-2026-25732?
CVE-2026-25732 is a vulnerability with a CVSS score of 7.5 (HIGH). NiceGUI is a Python-based UI framework. Prior to 3.7.0, NiceGUI's FileUpload.name property exposes client-supplied filename metadata without sanitization, enabling path traversal when developers use t...
How severe is CVE-2026-25732?
CVE-2026-25732 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-25732?
Check the references section above for vendor advisories and patch information. Affected products include: Zauberzeug Nicegui.