CVE-2025-53539 describes a denial-of-service vulnerability in FastAPI Guard, a security library for FastAPI, affecting versions prior to 3.0.1. The flaw stems from inefficient regex patterns used in its penetration attempt detection, which can lead to polynomial complexity backtracks when processing specially crafted inputs. This vulnerability carries a CVSS score of 7.5 (HIGH), indicating a network-based attack with low complexity that can result in high availability impact. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.0.1CPE matchmatch criteria | cpe:2.3:a:fastapi-guard:fastapi_guard:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.