CVE-2025-46814: FastAPI Guard Remote Header Injection via X-Forwarded-For Manipulation
Description
FastAPI Guard is a security library for FastAPI that provides middleware to control IPs, log requests, and detect penetration attempts. An HTTP header injection vulnerability has been identified in versions prior to 2.0.0. By manipulating the X-Forwarded-For header, an attacker can potentially inject arbitrary IP addresses into the request. This vulnerability can allow attackers to bypass IP-based access controls, mislead logging systems, and impersonate trusted clients. It is especially impactful when the application relies on the X-Forwarded-For header for IP-based authorization or authentication. Users should upgrade to FastAPI Guard version 2.0.0 to receive a fix.
Classification
CVE ID: CVE-2025-46814
CVSS Base Severity: LOW
CVSS Base Score: 3.4
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
Problem Types
CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')Affected Products
Vendor: rennf93
Product: fastapi-guard
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.08% (probability of being exploited)
EPSS Percentile: 24.23% (scored less or equal to compared to others)
EPSS Date: 2025-06-04 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-46814https://github.com/rennf93/fastapi-guard/security/advisories/GHSA-77q8-qmj7-x7pp
https://github.com/rennf93/fastapi-guard/commit/0b003fda4c678c1b514e95f319aee88113e9bf4b