Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Fastapi-Guard | Fastapi Guard | 3.0.1 |
Related Weaknesses (CWE)
References
- https://github.com/rennf93/fastapi-guard/commit/0829292c322d33dc14ab00c5451c5c13Patch
- https://github.com/rennf93/fastapi-guard/commit/d9d50e8130b7b434cdc1b001b8cfd03aPatch
- https://github.com/rennf93/fastapi-guard/security/advisories/GHSA-rrf6-pxg8-684gExploitVendor Advisory
- https://github.com/rennf93/fastapi-guard/security/advisories/GHSA-rrf6-pxg8-684gExploitVendor Advisory
FAQ
What is CVE-2025-54365?
CVE-2025-54365 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 mitigat...
How severe is CVE-2025-54365?
CVE-2025-54365 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-54365?
Check the references section above for vendor advisories and patch information. Affected products include: Fastapi-Guard Fastapi Guard.