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  5. CVE-2022-23516

CVE-2022-23516: Uncontrolled Recursion in Loofah

December 13, 2022 (updated November 4, 2025)

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.

References

  • github.com/advisories/GHSA-3x8r-x6xp-q4vm
  • github.com/flavorjones/loofah
  • github.com/flavorjones/loofah/commit/86f7f6364491b0099d215db858ecdc0c89ded040
  • github.com/flavorjones/loofah/security/advisories/GHSA-3x8r-x6xp-q4vm
  • github.com/rubysec/ruby-advisory-db/blob/master/gems/loofah/CVE-2022-23516.yml
  • lists.debian.org/debian-lts-announce/2023/09/msg00011.html
  • lists.debian.org/debian-lts-announce/2024/09/msg00044.html
  • nvd.nist.gov/vuln/detail/CVE-2022-23516

Code Behaviors & Features

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Affected versions

All versions starting from 2.2.0 before 2.19.1

Fixed versions

  • 2.19.1

Solution

Upgrade to version 2.19.1 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Learn more about CVSS

Weakness

  • CWE-674: Uncontrolled Recursion

Source file

gem/loofah/CVE-2022-23516.yml

Spotted a mistake? Edit the file on GitLab.

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