Junglewise Threat Intelligence

CVE-2025-53539: PYSEC-2026-1359 - fastapi-guard is vulnerable to ReDoS through inefficient regex

CVE-2025-53539 · Severity: medium · CVSS 4 · Published 2026-07-07

Technologies: fastapi-guard (PyPI). Vendors: PyPI.

Executive brief

fastapi-guard is vulnerable to ReDoS through inefficient regex

Affected products

PyPI fastapi-guard

Related threats

PYSEC-2026-1360 - FastAPI Guard has a regex bypass
PYSEC-2025-242 - FastAPI Guard is a security library for FastAPI that provides middleware to control IPs, log requests, and detect penetration attempts. An H