Flask-CORS improper regex path matching vulnerability
corydolphin/flask-cors version 5.0.1 contains an improper regex path matching vulnerability. The plugin prioritizes longer regex patterns over more specific ones when matching paths, which can lead to less restrictive CORS policies being applied to sensitive endpoints. This mismatch in regex pattern priority allows unauthorized cross-origin access to sensitive data or functionality, potentially exposing confidential information and increasing the risk of unauthorized actions by malicious actors.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | flask-cors | < 6.0.0 | 6.0.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2024-6839
- https://github.com/corydolphin/flask-cors/commit/e970988bea563e05e8b8f53fa7bcc134b5bf5c5f
- https://github.com/corydolphin/flask-cors
- https://github.com/corydolphin/flask-cors/blob/4.0.1/flask_cors/core.py#L73
- https://huntr.com/bounties/403eb1fc-86f4-4820-8eba-0f3dfae9f2b4
- https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html
- https://pypi.org/project/flask-cors
- https://github.com/advisories/GHSA-7rxf-gvfg-47g4
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-41- Platform
- Python (PyPI)
- Package
flask-cors- Disclosed
- 20.03.2025
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1384 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-7rxf-gvfg-47g4 - CC BY 4.0
Vulnerability history: flask-cors
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 08.2020 03.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 4
Disclosures per year
- 2020: 1
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 2
- 2025: 3
- 2026: 0
-
Flask-CORS improper regex path matching vulnerability this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.