---
id: CVE-2025-66645
title: NiceGUI is a Python-based UI framework
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 iss…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-22
vendor: zauberzeug
product: nicegui
affected:
  - nicegui < 3.4.0
patched:
  - nicegui 3.4.0
published: '2025-12-09'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T21:10:00.183'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66645'
references:
  - url: >-
      https://github.com/zauberzeug/nicegui/commit/a1b89e2a24e1911a40389ace2153a37f4eea92a9
    label: security-advisories@github.com
  - url: >-
      https://github.com/zauberzeug/nicegui/security/advisories/GHSA-hxp3-63hc-5366
    label: security-advisories@github.com
  - url: >-
      https://github.com/zauberzeug/nicegui/security/advisories/GHSA-hxp3-63hc-5366
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66645'
  - url: 'https://github.com/zauberzeug/nicegui'
tags:
  - nvd
  - osv
  - pip
  - exploit-available
epss: 0.0112
epssPercentile: 0.6601
aliases:
  - GHSA-hxp3-63hc-5366
  - PYSEC-2026-1700
ecosystem: pip
ingestedAt: '2026-07-08T18:25:50.350Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/prokeon5991-wq/cve-2025-66645'
  checkedAt: '2026-10-27T16:49:11.683Z'
exploitAvailable: true
---

## Overview

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

- `nicegui < 3.4.0`

## Remediation

Upgrade past the affected range:

- `nicegui 3.4.0`

## Package advisory (CVE-2025-66645)

Affected packages:

- `nicegui < 3.4.0`

Patched in:

- `nicegui 3.4.0`

Source: https://osv.dev/vulnerability/GHSA-hxp3-63hc-5366