{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "5.0.0"
                  },
                  {
                    "fixed": "5.4.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "1855061e572ae9dab727c811d8382f266bfbaae"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "v5.4.1",
                "range": [
                  {
                    "fixed": "a6a9673a54d2c719ceb32ce6a929d35483acfb2b"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "9500f2745481e2dff1313e2e6734c488e80c13fb"
            },
            {
              "fixed": "a6a9673a54d2c719ceb32ce6a929d35483acfb2b"
            },
            {
              "fixed": "1855061e572ae9dab727c811d8382f266bfbaae"
            }
          ],
          "repo": "https://github.com/labstack/echo",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-h53f-rm2w-w7rg"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-348"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118265.json"
  },
  "details": "Echo is a Go web framework. From 5.0.0 until 5.4.1, Echo v5's ExtractIPFromRealIPHeader validates whether the client-supplied X-Real-IP value belongs to a trusted range instead of validating the direct network peer. A client reaching Echo directly, or through a proxy that preserves the header, can supply a loopback or private address and have Context.RealIP return that spoofed identity. Applications using the extractor for IP allowlists, rate limiting, audit logs, or forwarding headers can consequently trust an attacker-controlled address; the default direct extractor and Echo v4 are unaffected. This issue is fixed in 5.4.1.",
  "id": "CVE-2026-118265",
  "modified": "2026-10-30T10:30:36.024062978Z",
  "published": "2026-10-28T19:03:56.934Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/labstack/echo/releases/tag/v5.4.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118265.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/labstack/echo/security/advisories/GHSA-h53f-rm2w-w7rg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118265"
    },
    {
      "type": "FIX",
      "url": "https://github.com/labstack/echo/commit/1855061e572ae9dab727c811d8382f266bfbaae"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Echo: X-Real-IP extractor trusts the header value instead of the sending peer"
}