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).

References

• CWE - CWE-1333: Inefficient Regular Expression Complexity (4.9)
• https://hackerone.com/reports/1684163

Credit

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

References

• GHSA-486f-hjj9-9vhh
• flavorjones/loofah@a6e0a1a
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/loofah/CVE-2022-23514.yml
• https://nvd.nist.gov/vuln/detail/CVE-2022-23514
• https://hackerone.com/reports/1684163
• https://lists.debian.org/debian-lts-announce/2023/09/msg00011.html