What is CVE-2025-66645?

CVE-2025-66645 is a high-severity vulnerability in Zauberzeug Nicegui, classified under Path Traversal. CVSS score: 7.5/10. Published 2025-12-09.

How severe is CVE-2025-66645?

High severity. CVSS v3 base score is 7.5 out of 10.

Path Traversal in Zauberzeug Nicegui

CVE-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.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2025-12-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.011 (64.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: +0.000

Affected products

Zauberzeug Nicegui — versions < 3.4.0

Weakness classification (CWE)

CWE-22 — Path Traversal

References

github.com/zauberzeug/nicegui/security/advisories/GHSA-hxp3-63hc-5366 (Exploit, Vendor Advisory)
github.com/zauberzeug/nicegui/commit/a1b89e2a24e1911a40389ace2153a37f4eea92a9 (Patch)

Frequently asked questions

What is CVE-2025-66645?: CVE-2025-66645 is a high-severity vulnerability in Zauberzeug Nicegui, classified under Path Traversal. CVSS score: 7.5/10. Published 2025-12-09.
How severe is CVE-2025-66645?: High severity. CVSS v3 base score is 7.5 out of 10.