CVE-2025-54365 (GCVE-0-2025-54365)
Vulnerability from cvelistv5 – Published: 2025-07-23 22:11 – Updated: 2025-07-24 13:36
VLAI
EPSS
VEX
Title
fastapi-guard patch contains bypassable RegEx
Summary
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.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-07-24 13:13 UTC
Assigner
GitHub_M
CNA
References
3 references
| URL | Tags |
|---|---|
| https://github.com/rennf93/fastapi-guard/security… | x_refsource_CONFIRM |
| https://github.com/rennf93/fastapi-guard/commit/0… | x_refsource_MISC |
| https://github.com/rennf93/fastapi-guard/commit/d… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| rennf93 | fastapi-guard |
Affected:
>= 3.0.1, < 3.0.2
|
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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