PYSEC-2026-1383
Flask-CORS vulnerable to Improper Handling of Case Sensitivity
At a glance
- Published
- Updated
- CVE
- CVE-2024-6866
- Aliases
- GHSA-43qf-4rqw-9q2g
- CVSS_V3
- CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Description
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
| Package | Versions |
|---|---|
| PyPI · flask-cors | introduced 0, fixed 6.0.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2024-6866 ADVISORY
- https://github.com/corydolphin/flask-cors/commit/eb39516a3c96b90d0ae5f51293972395ec3ef358 WEB
- https://github.com/corydolphin/flask-cors PACKAGE
- https://github.com/corydolphin/flask-cors/blob/4.0.1/flask_cors/extension.py#L195 WEB
- https://huntr.com/bounties/808c11af-faee-43a8-824b-b5ab4f62b9e6 WEB
- https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html WEB
- https://pypi.org/project/flask-cors PACKAGE
- https://github.com/advisories/GHSA-43qf-4rqw-9q2g ADVISORY
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |