{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "1.0.4"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "de308c70d31e13bfaf86e979e0f74bced6b2e236"
            }
          ],
          "repo": "https://github.com/fluent/fluent-bit",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "An issue was discovered in the MQTT input plugin in Fluent Bit through 1.0.4. When this plugin acts as an MQTT broker (server), it mishandles incoming network messages. After processing a crafted packet, the plugin's mqtt_packet_drop function (in /plugins/in_mqtt/mqtt_prot.c) executes the memmove() function with a negative size parameter. That leads to a crash of the whole Fluent Bit server via a SIGSEGV signal.",
  "id": "CVE-2019-9749",
  "modified": "2026-03-13T21:49:01.477363745Z",
  "published": "2019-03-13T19:29:00.297Z",
  "references": [
    {
      "type": "EVIDENCE",
      "url": "https://github.com/fluent/fluent-bit/issues/1135"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}