TI-2026-20800 Aliases CVE-2026-25732 GHSA-9ffm-fxg3-xrhh

NiceGUI's Path Traversal via Unsanitized FileUpload.name Enables Arbitrary File Write

MEDIUM 45CWE-22Published 2026-02-06 · Updated 2026-02-09

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Spoofing
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-601.

Summary

NiceGUI is a Python-based UI framework. Prior to 3.7.0, NiceGUI's FileUpload.name property exposes client-supplied filename metadata without sanitization, enabling path traversal when developers use the pattern UPLOAD_DIR / file.name. Malicious filenames containing ../ sequences allow attackers to write files outside intended directories, with potential for remote code execution through application file overwrites in vulnerable deployment patterns. This design creates a prevalent security footgun affecting applications following common community patterns. Note: Exploitation requires application code incorporating file.name into filesystem paths without sanitization. Applications using fixed paths, generated filenames, or explicit sanitization are not affected. This vulnerability is fixed in 3.7.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.03379 88th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed nicegui (zauberzeug): 3.7.0nicegui (PyPI): 3.7.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
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 3.7.0	3.7.0	Patch available	CNA
—	nicegui (PyPI)	before 3.7.0	3.7.0	Patch available	GHSA-9ffm-fxg3-xrhh

nicegui Vendorzauberzeug Affected before 3.7.0 Fixed in 3.7.0 Patch available CNA
nicegui (PyPI) Vendor— Affected before 3.7.0 Fixed in 3.7.0 Patch available GHSA-9ffm-fxg3-xrhh

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:zauberzeug:nicegui::::::::	before 3.7.0	Vulnerable	zauberzeug

cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:* Versions before 3.7.0 Vulnerable ·zauberzeug

Remediation

Fix · CNA nicegui (zauberzeug) Fixed in 3.7.0
Fix · GHSA-9ffm-fxg3-xrhh nicegui (PyPI) Fixed in 3.7.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-25732
2026-10-03 Alias added: GHSA-9ffm-fxg3-xrhh

References

Exploit 1

https://github.com/zauberzeug/nicegui/security/advisories/GHSA-9ffm-fxg3-xrhh

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-25732

Other 2

TI-2025-41029 NiceGUI Path Traversal Vulnerability in app.add_media_files() Allows Arbitrary File Reading CVSS 3.1HIGH 7.5
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

See all 11 →

Sources

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