Security advisory

{
  "id": "02b53ba6adfe11f317832e1455732955fef899a07508a07a0ac2f3973a137db7",
  "url": "https://osv.dev/vulnerability/CVE-2019-6293",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-6293",
    "summary": "An issue was discovered in the function mark_beginning_as_normal in nfa.c in flex 2.6.4. There is a stack exhaustion problem caused by the mark_beginning_as_normal function making recursive calls to itself in certain scenarios involving lots of '*' characters. Remote attackers could leverage this vulnerability to cause a denial-of-service.",
    "evidence": "osv:CVE-2019-6293",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2019-6293",
      "aliases": [
        "CVE-2019-6293"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/westes/flex",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ab49343b08c933e32de8de78132649f9560a3727"
                },
                {
                  "last_affected": "ab49343b08c933e32de8de78132649f9560a3727"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:westes:flex:2.6.4:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.6.4"
                      },
                      {
                        "last_affected": "2.6.4"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.6.4",
            "v2.6.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-6293.json"
          }
        }
      ],
      "modified": "2026-10-20T10:51:40.745909017Z",
      "provider": "osv",
      "references": [
        "https://github.com/westes/flex/issues/414"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2019-6293",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 382756,
  "published_at": "2019-01-15T00:29:00.523+00:00"
}