CVE-2021-27186: Treasuredata Fluent Bit

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

Fluent Bit 1.6.10 has a NULL pointer dereference when an flb_malloc return value is not validated by flb_avro.c or http_server/api/v1/metrics.c.

Affected products

• Treasuredata Fluent Bit: version 1.6.10 only

Published 2021-02-10. Last modified 2026-06-17.