Vulnerability Description
NiceGUI is a Python-based UI framework. Prior to version 3.9.0, NiceGUI's app.add_media_file() and app.add_media_files() media routes accept a user-controlled query parameter that influences how files are read during streaming. The parameter is passed to the range-response implementation without validation, allowing an attacker to bypass chunked streaming and force the server to load entire files into memory at once. With large media files and concurrent requests, this can lead to excessive memory consumption, degraded performance, or denial of service. This issue has been patched in version 3.9.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zauberzeug | Nicegui | < 3.9.0 |
Related Weaknesses (CWE)
References
- https://github.com/zauberzeug/nicegui/commit/9026962b8c4f3f225c98b2fbc35aa6b60cbPatch
- https://github.com/zauberzeug/nicegui/releases/tag/v3.9.0ProductRelease Notes
- https://github.com/zauberzeug/nicegui/security/advisories/GHSA-w5g8-5849-vj76MitigationVendor Advisory
FAQ
What is CVE-2026-33332?
CVE-2026-33332 is a vulnerability with a CVSS score of 7.5 (HIGH). NiceGUI is a Python-based UI framework. Prior to version 3.9.0, NiceGUI's app.add_media_file() and app.add_media_files() media routes accept a user-controlled query parameter that influences how files...
How severe is CVE-2026-33332?
CVE-2026-33332 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-2026-33332?
Check the references section above for vendor advisories and patch information. Affected products include: Zauberzeug Nicegui.