NiceGUI Path Traversal Vulnerability in app.add_media_files() Allows Arbitrary File Reading
Priority HIGH 72CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0112 66th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed nicegui (zauberzeug): 3.4.0nicegui (PyPI): 3.4.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| zauberzeug | nicegui | before 3.4.0 | 3.4.0 | Patch available | CNA |
| — | nicegui (PyPI) | before 3.4.0 | 3.4.0 | Patch available | GHSA-hxp3-63hc-5366 |
- nicegui Vendorzauberzeug Affected before 3.4.0 Fixed in 3.4.0 Patch available CNA
- nicegui (PyPI) Vendor— Affected before 3.4.0 Fixed in 3.4.0 Patch available GHSA-hxp3-63hc-5366
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:* | before 3.4.0 | Vulnerable | zauberzeug |
- cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:* Versions before 3.4.0 Vulnerable ·zauberzeug
Remediation
- Fix · CNA nicegui (zauberzeug) Fixed in 3.4.0
- Fix · GHSA-hxp3-63hc-5366 nicegui (PyPI) Fixed in 3.4.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-66645
- 2026-10-03 Alias added: GHSA-hxp3-63hc-5366
References
More zauberzeug Nicegui vulnerabilities
- TI-2026-17574 Zero-click XSS in all NiceGUI apps which uses `ui.sub_pages` CVSS 3.1HIGH 7.2
- TI-2026-17575 NiceGUI has Redis connection leak via tab storage causes service degradation CVSS 3.1MEDIUM 5.3
- TI-2026-17573 NiceGUI apps are vulnerable to XSS which uses `ui.sub_pages` and render arbitrary user-provided links CVSS 3.1MEDIUM 6.1
- TI-2026-17572 NiceGUI is vulnerable to XSS via Unescaped URL in ui.navigate.history.push() / replace() CVSS 3.1MEDIUM 6.1
- TI-2025-40897 NiceGUI Stored/Reflected XSS in ui.interactive_image via unsanitized SVG content CVSS 3.1MEDIUM 6.1
- TI-2025-40896 NiceGUI Reflected XSS in ui.add_css, ui.add_scss, and ui.add_sass via Style Injection CVSS 3.1MEDIUM 6.1
Sources
- CVE-2025-66645 · CVE Program
- CVE-2025-66645 · NVD
- FIRST EPSS
- GHSA-hxp3-63hc-5366 · GitHub Advisory Database · CC BY 4.0
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