CVE-2025-54365
Last modified
CVE-2025-54365 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.73% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Fastapi-Guard | Fastapi Guard | 3.0.1 |
References
- https://github.com/rennf93/fastapi-guard/security/advisories/GHSA-rrf6-pxg8-684gExploit, Vendor Advisory
- https://github.com/rennf93/fastapi-guard/security/advisories/GHSA-rrf6-pxg8-684gExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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