CVE-2025-46814

3.4 LOW 0.3% exploit odds Fix listed Other Web app

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in, but needs a user to act. Limited direct impact.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2025-05-06 15:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 09:26 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.3% in the next 30 days (EPSS).
Severity: 3.4 LOW (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2025-05-06 15:16 UTC
Last modified: 2026-06-17 09:26 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-74
Record status: Analyzed

Affected

fastapi-guard Fastapi Guard < 2.0.0

Attack profile CVSS 3.1 · 3.4

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: Required
Scope: Changed
Confidentiality: Low
Integrity: None
Availability: None

Raw vector

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

Is it in your code?

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Read https://cve-list.com/agent/cve/CVE-2025-46814.md and follow it. Check whether this project is affected by CVE-2025-46814. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record