CVE-2025-54365
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductFastapi-guard Fastapi Guard
PublishedJul 23, 2025
First seenJul 23, 2025
Weakness typeCWE-20Improper input validationCWE-185CWE-185
How to fix
Update
- fastapi-guard3.0.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| fastapi-guard fastapi_guard | 3.0.1 | — |
| fastapi-guardPyPI | 3.0.1 ≤ v < 3.0.2 | 3.0.2 |
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