GHSA-43qf-4rqw-9q2g
Flask-CORS vulnerable to Improper Handling of Case Sensitivity
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| PyPI | flask-cors | < 6.0.0 | 6.0.0 |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2024-6866
- https://github.com/corydolphin/flask-cors/commit/eb39516a3c96b90d0ae5f51293972395ec3ef358
- https://github.com/corydolphin/flask-cors
- https://github.com/corydolphin/flask-cors/blob/4.0.1/flask_cors/extension.py#L195
- https://huntr.com/bounties/808c11af-faee-43a8-824b-b5ab4f62b9e6
- https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html