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.

INFO

Published Date :

2025-07-07T19:16:02.559Z

Last Modified :

2025-07-07T20:51:58.541Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2025-53539 vulnerability.

Vendors Products
Fastapi-guard
  • Fastapi Guard
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-53539.

URL Resource
https://github.com/rennf93/fastapi-guard/commit/d9d50e8130b7b434cdc1b001b8cfd03a06729f7f cve-icon cve-icon
https://github.com/rennf93/fastapi-guard/security/advisories/GHSA-j47q-rc62-w448 cve-icon cve-icon
Login to claim this CVE

CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact