{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "5.4.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7f9b7448f51d28804fac98c0a17bc2a7cec1079f"
            }
          ],
          "repo": "https://github.com/go-chi/chi",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-j6qf-3m9c-vwj3"
  ],
  "database_specific": {
    "cna_assigner": "tenable",
    "cwe_ids": [
      "CWE-348"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114437.json"
  },
  "details": "In the Golang Chi web framework, the ClientIPFromXFF middleware skips any X-Forwarded-For entry in a configured trusted CIDR but never verifies that the direct TCP peer in http.Request.RemoteAddr belongs to that CIDR. A client that can reach the Go server directly can therefore append a trusted-looking proxy address and choose the client IP returned by middleware.GetClientIP.\n\nThis issue affects chi before 5.4.0.",
  "id": "CVE-2026-114437",
  "modified": "2026-10-22T02:30:57.263249027Z",
  "published": "2026-10-21T13:52:25.617Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114437.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/go-chi/chi/security/advisories/GHSA-j6qf-3m9c-vwj3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114437"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev"
    },
    {
      "type": "WEB",
      "url": "https://www.tenable.com/security/research/tra-2026-66"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Chi Client IP Spoofing in ClientIPFromXFF via X-Forwarded-For"
}