Duplicate Advisory: chi: Client IP spoofing in ClientIPFromXFF via X-Forwarded-For

{
  "id": "821b7c2df8547aa750c74588e6fff319fb554949c6ff79fd036c135c5c2a24ab",
  "url": "https://osv.dev/vulnerability/GHSA-7cgw-qmxx-7fc2",
  "method": "structured",
  "payload": {
    "kind": "withdrawal",
    "title": "Duplicate Advisory: chi: Client IP spoofing in ClientIPFromXFF via X-Forwarded-For",
    "summary": "## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-j6qf-3m9c-vwj3. This link is maintained to preserve external references. ## Original Description 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. This issue affects chi before 5.4.0.",
    "evidence": "osv:GHSA-7cgw-qmxx-7fc2",
    "products": [
      {
        "name": {
          "value": "github.com/go-chi/chi/v5",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-7cgw-qmxx-7fc2",
      "aliases": [
        "GHSA-7cgw-qmxx-7fc2"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"
        },
        {
          "type": "CVSS_V4",
          "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "5.3.2"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/go-chi/chi/v5",
            "purl": "pkg:golang/github.com/go-chi/chi/v5",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-7cgw-qmxx-7fc2/GHSA-7cgw-qmxx-7fc2.json"
          }
        }
      ],
      "modified": "2026-10-23T21:15:03.744165797Z",
      "provider": "osv",
      "references": [
        "https://github.com/go-chi/chi/security/advisories/GHSA-j6qf-3m9c-vwj3",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-114437",
        "https://www.tenable.com/security/research/tra-2026-66"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-348"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-21T14:17:14Z",
        "github_reviewed_at": "2026-10-23T20:56:29Z"
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": "/severity/1/score"
  },
  "source_id": "core-osv",
  "document_id": 427037,
  "published_at": "2026-10-21T15:42:31+00:00"
}