CVE-2022-23514 — Inefficient Regular Expression Complexity 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 < 2.19.1 contains an inefficient regular expression that is susceptible to excessive backtracking when attempting to sanitize certain SVG attributes. This may lead to a denial of service through CPU resource consumption. This issue is patched in version 2.19.1.

GHSA-486f-hjj9-9vhh — Inefficient Regular Expression Complexity in Loofah

Affected: RubyGems: loofah

## Summary

Loofah `< 2.19.1` contains an inefficient regular expression that is susceptible to excessive backtracking when attempting to sanitize certain SVG attributes. This may lead to a denial of service through CPU resource consumption.

## Mitigation

Upgrade to Loofah `>= 2.19.1`.

## 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-1333: Inefficient Regular Expression Complexity (4.9)](https://cwe.mitre.org/data/definitions/1333.html) - https://hackerone.com/reports/1684163

## Credit

This vulnerability was responsibly reported by @ooooooo-q (https://github.com/ooooooo-q).

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CVE-2022-23514 — Inefficient Regular Expression Complexity in Loofah

GHSA-486f-hjj9-9vhh — Inefficient Regular Expression Complexity in Loofah