CVE-2025-46814

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.

Reserved 2025-04-30 | Published 2025-05-06 | Updated 2025-05-06 | Assigner GitHub_M

Problem types

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Product status

< 2.0.0
affected

References

github.com/...-guard/security/advisories/GHSA-77q8-qmj7-x7pp

github.com/...ommit/0b003fda4c678c1b514e95f319aee88113e9bf4b

cve.org (CVE-2025-46814)

nvd.nist.gov (CVE-2025-46814)

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