CVE-2026-33332
NiceGUI's unvalidated chunk size parameter in media routes can cause memory exhaustion
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
7th
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.
| CWE | CWE-20 CWE-770 |
| Vendor | zauberzeug |
| Product | nicegui |
| Published | Mar 24, 2026 |
| Last Updated | Mar 25, 2026 |
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Affected Versions
zauberzeug / nicegui
< 3.9.0