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Critical

Security advisory

Type: advisorySources: OSVCVE: CVE-2018-9230

In OpenResty through 1.13.6.1, URI parameters are obtained using the ngx.req.get_uri_args and ngx.req.get_post_args functions that ignore parameters beyond the hundredth one, which might allow remote attackers to bypass intended access restrictions or interfere with certain Web Application Firewall (ngx_lua_waf or X-WAF) products. NOTE: the vendor has reported that 100 parameters is an intentional default setting, but is adjustable within the API. The vendor's position is that a security-relevant misuse of the API by a WAF product is a vulnerability in the WAF product, not a vulnerability in OpenResty

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2018-9230
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 06:33 UTC · Revision 1

Source evidence

CVE-2018-9230

core-osv · Original source

Published 2 Apr 2018, 18:29 UTC

In OpenResty through 1.13.6.1, URI parameters are obtained using the ngx.req.get_uri_args and ngx.req.get_post_args functions that ignore parameters beyond the hundredth one, which might allow remote attackers to bypass intended access restrictions or interfere with certain Web Application Firewall (ngx_lua_waf or X-WAF) products. NOTE: the vendor has reported that 100 parameters is an intentional default setting, but is adjustable within the API. The vendor's position is that a security-relevant misuse of the API by a WAF product is a vulnerability in the WAF product, not a vulnerability in OpenResty

osv:CVE-2018-9230
Complete source record
{
  "id": "f63afd881ff4adda05c6c23bf6a1146d8aa601901ee5560204fa0e252c6b1160",
  "url": "https://osv.dev/vulnerability/CVE-2018-9230",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-9230",
    "summary": "In OpenResty through 1.13.6.1, URI parameters are obtained using the ngx.req.get_uri_args and ngx.req.get_post_args functions that ignore parameters beyond the hundredth one, which might allow remote attackers to bypass intended access restrictions or interfere with certain Web Application Firewall (ngx_lua_waf or X-WAF) products. NOTE: the vendor has reported that 100 parameters is an intentional default setting, but is adjustable within the API. The vendor's position is that a security-relevant misuse of the API by a WAF product is a vulnerability in the WAF product, not a vulnerability in OpenResty",
    "evidence": "osv:CVE-2018-9230",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2018-9230",
      "aliases": [
        "CVE-2018-9230"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openresty/openresty",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "d2618c31355a2f7e7ac88ab845a72f61c3505f8b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:openresty:openresty:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.13.6.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.11.2.5",
            "v1.11.2.3",
            "v1.11.2.2",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-9230.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:41.154243609Z",
      "provider": "osv",
      "references": [
        "https://openresty.org/en/changelog-1013006.html",
        "https://github.com/Bypass007/vuln/blob/master/OpenResty/Uri%20parameter%20overflow%20in%20Openresty.md"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-9230",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 435087,
  "published_at": "2018-04-02T18:29:00.233+00:00"
}