{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:chimurai:http-proxy-middleware:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0.16.0"
              },
              {
                "fixed": "2.0.10"
              },
              {
                "introduced": "3.0.0"
              },
              {
                "fixed": "3.0.6"
              },
              {
                "introduced": "4.0.0"
              },
              {
                "fixed": "4.1.0"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "09926cdd29573e2966993a743d8b68e415f9c6b5"
            },
            {
              "fixed": "f0be839066ba14f2598c6c1aef10ff54b020babb"
            },
            {
              "introduced": "84bfa46fc7174f46b9f24c1e7a7a1a977f0993f3"
            },
            {
              "fixed": "ea0bb98867bda354b759e92ce1933ab43cbbbcf8"
            },
            {
              "introduced": "8f356bcb5fce079460564f729da55814363361a6"
            },
            {
              "fixed": "013dd9bbdf3436fe9c17a2c24a0d04a0fcb6de19"
            }
          ],
          "repo": "https://github.com/chimurai/http-proxy-middleware",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-64mm-vxmg-q3vj"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-187",
      "CWE-20"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55602.json"
  },
  "details": "http-proxy-middleware is node.js http-proxy middleware. From 0.16.0 until 2.0.10, 3.0.6, and 4.1.0, http-proxy-middleware documents router proxy-table entries as host, path, or host+path selectors, but the host+path implementation uses unanchored substring matching on attacker-controlled request metadata. As a result, a crafted Host header that is only a superstring match for a configured host+path key can still route a request to an unintended backend. This vulnerability is fixed in 2.0.10, 3.0.6, and 4.1.0.",
  "id": "CVE-2026-55602",
  "modified": "2026-07-15T01:49:06.783665583Z",
  "published": "2026-06-22T15:58:08.699Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55602.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/chimurai/http-proxy-middleware/security/advisories/GHSA-64mm-vxmg-q3vj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55602"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "http-proxy-middleware `router` host+path substring matching allows Host-header-driven backend routing bypass"
}