>= 2.2.0, < 2.19.1 uses recursion for sanitizing
CDATA sections, making it susceptible to stack exhaustion and raising a
SystemStackError exception. This may lead to a denial of service through CPU resource consumption.
Upgrade to Loofah
Users who are unable to upgrade may be able to mitigate this vulnerability by limiting the length of the strings that are sanitized.
The Loofah maintainers have evaluated this as High Severity 7.5 (CVSS3.1).