{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "3.1.0"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "ab24a20faf28156f0495b0c07f2ff37860a3defe"
            }
          ],
          "repo": "https://github.com/spiderlabs/owasp-modsecurity-crs",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3.1.0. /rules/REQUEST-933-APPLICATION-ATTACK-PHP.conf allows remote attackers to cause a denial of service (ReDOS) by entering a specially crafted string with $a# at the beginning and nested repetition operators. NOTE: the software maintainer disputes that this is a vulnerability because the issue cannot be exploited via ModSecurity",
  "id": "CVE-2019-11391",
  "modified": "2026-03-13T21:55:04.451965209Z",
  "published": "2019-04-21T02:29:00.487Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://github.com/SpiderLabs/owasp-modsecurity-crs/issues/1357"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/SpiderLabs/owasp-modsecurity-crs/issues/1372"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ]
}