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CVE-2025-53539

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 6.9 · Medium · EPSS 0.5% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • fastapi-guard

    Versions
    • < 3.0.1: Affected

    No fix published

  • fastapi-guard PyPI

    Versions
    • 0.1.0
    • 0.2.0
    • 0.3.2
    • 0.3.3
    • 0.3.4
    • 0.4.0
    • 1.0.0
    • 1.1.0
    • 1.2.0
    • 1.2.1
    • 1.2.2
    • 1.3.2
    • 1.4.0
    • 1.5.0
    • 2.0.0
    • 2.0.1
    • 2.1.0
    • 2.1.1
    • 2.1.2
    • 2.1.3
    • 3.0.0
    Affected ranges
    • ECOSYSTEM: < 3.0.1

    Update to 3.0.1

Original sources

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