high7.5
CVE-2024-6866
Flask-CORS vulnerable to Improper Handling of Case Sensitivity
Impact
corydolphin/flask-cors version 5.0.1 contains a vulnerability where the request path matching is case-insensitive due to the use of the `try_match` function, which is originally intended for matching hosts. This results in a mismatch because paths in URLs are case-sensitive, but the regex matching treats them as case-insensitive. This misconfiguration can lead to significant security vulnerabilities, allowing unauthorized origins to access paths meant to be restricted, resulting in data exposure and potential data leaks.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | flask-cors | <= 5.0.1 | 6.0.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Flask-Cors Project | Flask-Cors | Version 4.0.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://huntr.com/bounties/808c11af-faee-43a8-824b-b5ab4f62b9e6
- https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html
- https://github.com/advisories/GHSA-43qf-4rqw-9q2g
- https://nvd.nist.gov/vuln/detail/CVE-2024-6866
- https://github.com/corydolphin/flask-cors/blob/4.0.1/flask_cors/extension.py#L195
- https://github.com/corydolphin/flask-cors/commit/eb39516a3c96b90d0ae5f51293972395ec3ef358