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  5. CVE-2024-6866

CVE-2024-6866: Flask-CORS vulnerable to Improper Handling of Case Sensitivity

March 20, 2025 (updated November 3, 2025)

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

  • github.com/advisories/GHSA-43qf-4rqw-9q2g
  • github.com/corydolphin/flask-cors
  • github.com/corydolphin/flask-cors/blob/4.0.1/flask_cors/extension.py
  • github.com/corydolphin/flask-cors/commit/eb39516a3c96b90d0ae5f51293972395ec3ef358
  • huntr.com/bounties/808c11af-faee-43a8-824b-b5ab4f62b9e6
  • lists.debian.org/debian-lts-announce/2025/05/msg00049.html
  • nvd.nist.gov/vuln/detail/CVE-2024-6866

Code Behaviors & Features

Detect and mitigate CVE-2024-6866 with GitLab Dependency Scanning

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Affected versions

All versions before 6.0.0

Fixed versions

  • 6.0.0

Solution

Upgrade to version 6.0.0 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Learn more about CVSS

Weakness

  • CWE-178: Improper Handling of Case Sensitivity

Source file

pypi/flask-cors/CVE-2024-6866.yml

Spotted a mistake? Edit the file on GitLab.

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