CVE-2019-6293: Westes Flex

Medium severity, CVSS 5.5. EPSS: 1.6% chance of exploitation in the next 30 days.

An issue was discovered in the function mark_beginning_as_normal in nfa.c in flex 2.6.4. There is a stack exhaustion problem caused by the mark_beginning_as_normal function making recursive calls to itself in certain scenarios involving lots of '*' characters. Remote attackers could leverage this vulnerability to cause a denial-of-service.

Affected products

• Westes Flex: version 2.6.4 only

Published 2019-01-15. Last modified 2026-06-17.