VYPR
Moderate severityNVD Advisory· Published Jul 7, 2025· Updated Jul 7, 2025

ReDoS in fastapi-guard's penetration attempts detector

CVE-2025-53539

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
fastapi-guardPyPI
< 3.0.13.0.1

Affected products

2

Patches

Vulnerability mechanics

References

4

News mentions

0

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