USN-7612-1: Flask-CORS vulnerabilities

USN-7612-1: Flask-CORS vulnerabilities
Publication date: 2 July 2025
Overview: Several security issues were fixed in Flask-CORS.

Packages

• python-flask-cors - Flask extension for handling Cross Origin Resource Sharing (CORS)

Details
It was discovered that Flask-CORS did not correctly handle certain regular
expressions. A remote attacker could possibly use this issue to leak
sensitive information or bypass authentication mechanisms. (CVE-2024-6839)
It was discovered that Flask-CORS allowed certain CORS headers to be
enabled by default. A remote attacker could possibly use this issue to leak
sensitive information. This issue only affected Ubuntu 20.04 LTS, Ubuntu
22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 24.10. (CVE-2024-6221) It was
discovered that Flask-CORS did not correctly handle case sensitivity when
matching paths. A remote attacker could possibly use this issue to leak
sensitive information. (CVE-2024-6866) It was discovered that Flask-CORS
did not correctly handle certain characters in URL paths. A remote attacker
could possibly use this issue to leak sensitive information or bypass
authentication mechanisms. (CVE-2024-6844) Elias Hohl was discovered that
Flask-CORS did not correctly sanitize log entries. A remote attacker could
possibly use this issue to corrupt log files. This issue only affected
Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2024-1681)

Update instructions

• 25.04 : plucky python3-flask-cors – 5.0.0-1ubuntu0.1
• 24.10: oracular python3-flask-cors – 4.0.1-1ubuntu0.1
• 24.04: noble python3-flask-cors – 4.0.0-1ubuntu0.1~esm1
• 22.04: jammy python3-flask-cors – 3.0.9-2ubuntu0.1
• 20.04: focal python3-flask-cors – 3.0.8-2ubuntu0.1+esm1