CVE-2025-53539 (GCVE-0-2025-53539)
Vulnerability from cvelistv5
Published
2025-07-07 19:16
Modified
2025-07-07 20:51
Severity ?
6.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
Summary
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.
References
security-advisories@github.comhttps://github.com/rennf93/fastapi-guard/commit/d9d50e8130b7b434cdc1b001b8cfd03a06729f7f
security-advisories@github.comhttps://github.com/rennf93/fastapi-guard/security/advisories/GHSA-j47q-rc62-w448
Impacted products
Vendor Product Version
rennf93 fastapi-guard Version: < 3.0.1
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