CVE-2021-36088: Treasuredata Fluent Bit

Critical severity, CVSS 9.8. EPSS: 2.4% chance of exploitation in the next 30 days.

Fluent Bit (aka fluent-bit) 1.7.0 through 1.7.4 has a double free in flb_free (called from flb_parser_json_do and flb_parser_do).

Affected products

• Treasuredata Fluent Bit: from 1.7.0, up to and including 1.7.4

Published 2021-07-01. Last modified 2026-06-17.