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.

CVSS v3.1 Score

3.4

LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N

Weakness Type (CWE)

CWE-74 CWE-74

Affected Products

Vendor	Product	Versions
fastapi-guard	fastapi_guard	< 2.0.0

References

Advisories & Patches

https://github.com/rennf93/fastapi-guard/commit/0b003fda4c678c1b514e95f319aee88113e9bf4b https://github.com/rennf93/fastapi-guard/security/advisories/GHSA-77q8-qmj7-x7pp

Exploits

https://github.com/rennf93/fastapi-guard/security/advisories/GHSA-77q8-qmj7-x7pp

Frequently Asked Questions

What is CVE-2025-46814? +

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. It has a CVSS v3.1 base score of 3.4 (LOW).

How severe is CVE-2025-46814? +

CVE-2025-46814 has a CVSS v3.1 score of 3.4 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-46814? +

CVE-2025-46814 affects products from fastapi-guard, specifically: fastapi_guard. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-46814? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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