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Vulnerabilities

Vulnerability · CVE-2025-46814

FastAPI Guard is a security library for FastAPI that provides middleware to control IPs, log requests, and detect penetration attempts.

Published May 6, 2025 · catalog updated May 6, 2025 · FastAPI Guard is a

Check if you run it

No confirmed exploitation is on record for CVE-2025-46814. EPSS is 0.34%. Act only if a listed version of FastAPI Guard is a is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (FastAPI Guard is a).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low3.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.34%
Remediation
Version ranges on file
Affected products
vendor rennf93 fastapi-guard < 2.0.0

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 authentic

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor rennf93 fastapi-guard < 2.0.0< 2.0.0

How to fix CVE-2025-46814

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-46814. EPSS is 0.34%. Act only if a listed version of FastAPI Guard is a is installed.

Which versions are affected?

Compare what you have installed with rennf93 fastapi-guard < 2.0.0 < 2.0.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.34%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 6, 2025 · EUVD

    Detected

    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

  2. May 6, 2025 · EUVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2025-46814

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-46814

    30-day exploitation probability 0.3%

    first.org
  • EUVDVulnerability recordEUVD-2025-13598

    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 c

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.