CVE-2020-35963: Treasuredata Fluent Bit

High severity, CVSS 7.8. EPSS: 1.3% chance of exploitation in the next 30 days.

flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it does not use the correct calculation of the maximum gzip data-size expansion.

Affected products

• Treasuredata Fluent Bit: before 1.6.4 (fixed in 1.6.4)

Published 2021-01-03. Last modified 2026-06-17.