re2c before 2.0 has uncontrolled recursion that causes stack consumption in find_fixed_tags.
http://www.openwall.com/lists/oss-security/2020/05/14/4
Source: MITRE
Published: 2020-04-29
Updated: 2020-05-14
Type: CWE-674
Base Score: 4.3
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 5.5
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 1.8
Severity: MEDIUM