CVE-2016-6354: Debian Linux

Critical severity, CVSS 9.8. EPSS: 8.8% chance of exploitation in the next 30 days.

Heap-based buffer overflow in the yy_get_next_buffer function in Flex before 2.6.1 might allow context-dependent attackers to cause a denial of service or possibly execute arbitrary code via vectors involving num_to_read.

Affected products

• Debian Debian Linux: version 8.0 only
• Westes Flex: up to and including 2.6.0

Published 2016-09-21. Last modified 2026-06-17.