NiceGUI is a Python-based UI framework.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Dec 9, 2025 · NIST NVD

   Detected

   NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are vulnerable to directory traversal through the App.add_media_files() function, which allows a remote attacker to read arbitrary files on the server filesystem. This issue is fixed in version 3.4.0.

2. Oct 14, 2026 · NIST NVD

   Updated

   NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are vulnerable to directory traversal through the App.add_media_files() function, which allows a remote attacker to read arbitrary files on the server filesystem. This issue is fixed in version 3.4.0.

Affected

• cpe zauberzeug/niceguiversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2025-66645

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2025-66645

  30-day exploitation probability 1.1%

  first.org
• NIST NVDVulnerability recordCVE-2025-66645

  NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are vulnerable to directory traversal through the App.add_media_files() function, which allows a remote attacker to read arbitrary files on the server filesystem. This issue is fixed in version 3.4.0.

  nvd.nist.gov

References

• Patch · github.com
• Exploit · github.com