CVE-2026-39844
HIGH WAF: High
CVSS 7.5
Published: 2026-04-08
CWE-22
NiceGUI is a Python-based UI framework. Prior to 3.10.0, Since PurePosixPath only recognizes forward slashes (/) as path separators, an attacker can bypass this sanitization on Windows by using backslashes (\) in the upload filename. Applications that construct file paths using file.name (a pattern demonstrated in NiceGUI's bundled examples) are vulnerable to arbitrary file write on Windows. This vulnerability is fixed in 3.10.0.
WAF Coverage Analysis
Path Traversal
High WAF Coverage
OWASP: A01:2021 Broken Access Control
930xxx - Local File Inclusion
Affected Software
| Vendor | Product | Version |
|---|---|---|
| zauberzeug | nicegui | up to 3.10.0 |
References
- github.com (Patch)
- github.com (Release Notes)
- github.com (Vendor Advisory)