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.

Reserved 2025-07-02 | Published 2025-07-07 | Updated 2025-07-07 | Assigner GitHub_M

Problem types

CWE-1333: Inefficient Regular Expression Complexity

Product status

< 3.0.1
affected

References

github.com/...-guard/security/advisories/GHSA-j47q-rc62-w448

github.com/...ommit/d9d50e8130b7b434cdc1b001b8cfd03a06729f7f

cve.org (CVE-2025-53539)

nvd.nist.gov (CVE-2025-53539)

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