CVE-2025-54365

HIGH EPSS 49.8%
Published Jul 23, 202511mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 4.0
High
Find Similar
Published Jul 23, 2025 11mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
7.8
Exploitability
—
Impact
—
Vector string
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
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
49.8% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 3

CWE-1333
CWE-185
CWE-20 Improper Input Validation Validation

Affected Products 1

VendorProductVersionRange
fastapi-guardfastapi_guard3.0.1any

References 3

  • github.com https://github.com/rennf93/fastapi-guard/commit/0829292c322d33dc14ab00c5451c5c138148035a
    Patch
  • github.com https://github.com/rennf93/fastapi-guard/commit/d9d50e8130b7b434cdc1b001b8cfd03a06729f7f
    Patch
  • github.com https://github.com/rennf93/fastapi-guard/security/advisories/GHSA-rrf6-pxg8-684g
    ExploitVendor Advisory

Remediation

  • github.com https://github.com/rennf93/fastapi-guard/commit/0829292c322d33dc14ab00c5451c5c138148035a
    Patch
  • github.com https://github.com/rennf93/fastapi-guard/commit/d9d50e8130b7b434cdc1b001b8cfd03a06729f7f
    Patch