# CVE-2020-25032: python3-flask-cors: An issue was discovered in Flask-CORS (aka CORS Middleware for Flask) before 3.0.9

CVE-2020-25032 is fixed in python3-flask-cors on 1 platform by python3-flask-cors 3.0.8-2ubuntu0.1 (version 3.0.8-2ubuntu0.1), released August 30, 2020. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-25032
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0391
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 30, 2020

## Description

An issue was discovered in Flask-CORS (aka CORS Middleware for Flask) before 3.0.9. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python3-flask-cors Ubuntu 20.04 LTS (focal) | 3.0.8-2ubuntu0.1 | [python3-flask-cors 3.0.8-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-flask-cors-3.0.8-2ubuntu0.1.md) | Aug 30, 2020 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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