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CVE PROGRAM SOURCE RECORD6.9 Medium

CVE-2025-53539

ReDoS in fastapi-guard's penetration attempts detector

Description

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 inefficient and can cause polynomial complexity backtracks when handling specially crafted inputs. This vulnerability is fixed in 3.0.1.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

rennf93 fastapi-guard

  • < 3.0.1affected

References