CVEvulnerability

CVE-2025-54365

7.8 HIGH Published 2025-07-23 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2025-07-23
Last modified
2026-06-17
Assigner
[email protected]
CVSS 4.0 ([email protected])
7.8 HIGH — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:P/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
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-1333, CWE-185, CWE-20

Description

fastapi-guard is a security library for FastAPI that provides middleware to control IPs, log requests, detect penetration attempts and more. In version 3.0.1, the regular expression patched to mitigate the ReDoS vulnerability by limiting the length of string fails to catch inputs that exceed this limit. This type of patch fails to detect cases in which the string representing the attributes of a <script> tag exceeds 100 characters. As a result, most of the regex patterns present in version 3.0.1 can be bypassed. This is fixed in version 3.0.2.

Affected configurations

• fastapi-guard fastapi guard 3.0.1

Related

Weakness · CWE (3)

  • CWE-1333 Inefficient Regular Expression Complexity weakness
  • CWE-185 Incorrect Regular Expression weakness
  • CWE-20 Improper Input Validation weakness

References