CVE-2025-53539 ReDoS in fastapi-guard's penetration attempts detector

FastAPI Guard is a security library for FastAPI that provides middleware to control IPs, log requests, and detect penetration attempts. fastapi-guard's penetration attempts detection uses regex to scan incoming requests. However, some of the regex patterns used in detection are extremely...

CVE-2025-53539

CVE-2025-53539 affects fastapi-guard: the DoS risk stems from inefficient regular expressions in the SusPatternsManager (suspatterns_handler.py) used to detect penetration attempts, enabling polynomial backtracking under crafted inputs. The vulnerability is documented as fixed in version 3.0.1; r...

CVE-2025-53539: Inefficient Regular Expression Complexity

FastAPI Guard is a security library for FastAPI that provides middleware to control IPs, log requests, and detect penetration attempts. fastapi-guard's penetration attempts detection uses regex to scan incoming requests. However, some of the regex patterns used in detection are extremely...

CVE-2025-46814

CVE-2025-46814 affects the FastAPI Guard library (pre-2.0.0) and describes an HTTP header injection via the X-Forwarded-For header. The underlying issue allows an attacker to inject arbitrary IP addresses into requests, potentially bypassing IP-based access controls, misleading logs, and imperson...