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High severity7.5OSV Advisory· Published Mar 13, 2019· Updated Jun 17, 2026

CVE-2019-9749

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3
  • Fluent Bit/Fluent BitOSV2 versions
    0.13-dev-0.10, 0.13-dev-0.11, 0.13-dev-0.12, …+ 1 more
    • (no CPE)range: 0.13-dev-0.10, 0.13-dev-0.11, 0.13-dev-0.12, …
    • (no CPE)range: <=1.0.4
  • Treasuredata/Fluent Bit
    cpe:2.3:a:treasuredata:fluent_bit:*:*:*:*:*:*:*:*
    Range: <=1.0.4

Patches

Vulnerability mechanics

References

1

News mentions

0

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