CVE-2022-23516: Uncontrolled Recursion

December 14, 2022 (updated September 13, 2023)

Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Loofah >= 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. This issue is patched in version 2.19.1. Users who are unable to upgrade may be able to mitigate this vulnerability by limiting the length of the strings that are sanitized.

References

github.com/advisories/GHSA-3x8r-x6xp-q4vm
github.com/flavorjones/loofah/commit/86f7f6364491b0099d215db858ecdc0c89ded040
github.com/flavorjones/loofah/security/advisories/GHSA-3x8r-x6xp-q4vm
nvd.nist.gov/vuln/detail/CVE-2022-23516

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