CVE-2022-23516 — Uncontrolled Recursion in Loofah

Affected: flavorjones loofah

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.

GHSA-3x8r-x6xp-q4vm — Uncontrolled Recursion in Loofah

Affected: RubyGems: loofah

## Summary

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.

## Mitigation

Upgrade to Loofah `>= 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.

## Severity

The Loofah maintainers have evaluated this as [High Severity 7.5 (CVSS3.1)](https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

## References

- [CWE - CWE-674: Uncontrolled Recursion (4.9)](https://cwe.mitre.org/data/definitions/674.html)

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CVE-2022-23516 — Uncontrolled Recursion in Loofah

GHSA-3x8r-x6xp-q4vm — Uncontrolled Recursion in Loofah