CVE-2025-66645: nicegui Path Traversal

Description

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness Type (CWE)

CWE-22 Path Traversal

Affected Products

Vendor	Product	Versions
zauberzeug	nicegui	< 3.4.0

References

Advisories & Patches

https://github.com/zauberzeug/nicegui/commit/a1b89e2a24e1911a40389ace2153a37f4eea92a9 https://github.com/zauberzeug/nicegui/security/advisories/GHSA-hxp3-63hc-5366 https://github.com/zauberzeug/nicegui/security/advisories/GHSA-hxp3-63hc-5366

Exploits

https://github.com/zauberzeug/nicegui/security/advisories/GHSA-hxp3-63hc-5366 https://github.com/zauberzeug/nicegui/security/advisories/GHSA-hxp3-63hc-5366

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-66645? +

CVE-2025-66645 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-66645? +

CVE-2025-66645 affects products from zauberzeug, specifically: nicegui. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-66645? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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