{"id":"CVE-2019-9749","aliases":["EUVD-2019-19112","GHSA-8mpq-mw74-r6q5"],"status":"published","title":"An issue was discovered in the MQTT input plugin in Fluent Bit through 1.0.4. When this plugin...","description":"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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01657,"percentile":0.7678,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-681"],"published":"2019-03-13T19:00:00Z","modified":"2026-10-20T10:52:47Z","products":[{"vendor":"treasuredata","product":"fluent_bit"}],"references":[{"url":"https://github.com/fluent/fluent-bit/issues/1135","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-9749"},{"url":"https://github.com/advisories/GHSA-8mpq-mw74-r6q5"}],"sources":{"cve":[{"id":"CVE-2019-9749","description":"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.","status":"published","published":"2019-03-13T19:00:00Z","modified":"2024-09-16T22:29:41.796Z","updated_at":"2026-11-02T14:20:20.397093Z"}],"euvd":[{"id":"EUVD-2019-19112","description":"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.","status":"published","published":"2019-03-13T19:00:00Z","modified":"2024-09-16T22:29:41Z","updated_at":"2026-11-03T00:55:02.946444Z"}],"ghsa":[{"id":"GHSA-8mpq-mw74-r6q5","title":"An issue was discovered in the MQTT input plugin in Fluent Bit through 1.0.4. When this plugin...","description":"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.","status":"published","published":"2022-05-13T01:08:20Z","modified":"2023-02-01T05:03:13Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-681"],"updated_at":"2026-11-02T14:50:02.204531Z"}],"nvd":[{"id":"CVE-2019-9749","description":"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.","status":"published","published":"2019-03-13T19:29:00.297Z","modified":"2026-06-17T02:44:16.89Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-681"],"updated_at":"2026-11-02T14:05:07.268578Z"}],"osv":[{"id":"CVE-2019-9749","description":"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.","status":"published","published":"2019-03-13T19:29:00.297Z","modified":"2026-10-20T10:52:47.96564991Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:12.974481Z"}]}}