PYSEC-2025-242

Vulnerability from pysec - Published: 2025-05-06 15:16 - Updated: 2026-07-13 05:48
VLAI
Details

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.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Impacted products
Name purl
fastapi-guard pkg:pypi/fastapi-guard
Aliases
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "fastapi-guard",
        "purl": "pkg:pypi/fastapi-guard"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0",
        "0.2.0",
        "0.3.2",
        "0.3.3",
        "0.3.4",
        "0.4.0",
        "1.0.0",
        "1.1.0",
        "1.2.0",
        "1.2.1",
        "1.2.2",
        "1.3.2",
        "1.4.0",
        "1.5.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2025-46814",
    "GHSA-77q8-qmj7-x7pp"
  ],
  "details": "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.",
  "id": "PYSEC-2025-242",
  "modified": "2026-07-13T05:48:43.786922Z",
  "published": "2025-05-06T15:16:02.217Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/rennf93/fastapi-guard/commit/0b003fda4c678c1b514e95f319aee88113e9bf4b"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/rennf93/fastapi-guard/security/advisories/GHSA-77q8-qmj7-x7pp"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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