What’s Vulnerable › Vulnerabilities

CVE-2024-6839: Improper Regex Path Matching in corydolphin/flask-cors

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-03-20 · updated 2026-06-17
• Weakness: CWE-41

Description

corydolphin/flask-cors version 4.0.1 contains an improper regex path matching vulnerability. The plugin prioritizes longer regex patterns over more specific ones when matching paths, which can lead to less restrictive CORS policies being applied to sensitive endpoints. This mismatch in regex pattern priority allows unauthorized cross-origin access to sensitive data or functionality, potentially exposing confidential information and increasing the risk of unauthorized actions by malicious actors.

Affected products

• corydolphin/flask-cors: 4.0.1

References

• https://huntr.com/bounties/403eb1fc-86f4-4820-8eba-0f3dfae9f2b4
• https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html

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