Uncontrolled Recursion in 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)
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2022-23516US | high7.5 | — | ||
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 CD… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/flavorjones/loofahPACKAGE
- https://github.com/flavorjones/loofah/commit/86f7f6364491b0099d215db858ecdc0c89ded040WEB
- https://github.com/flavorjones/loofah/security/advisories/GHSA-3x8r-x6xp-q4vmWEB
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/loofah/CVE-2022-23516.ymlWEB
- https://lists.debian.org/debian-lts-announce/2023/09/msg00011.htmlWEB
- https://lists.debian.org/debian-lts-announce/2024/09/msg00044.htmlWEB
- https://nvd.nist.gov/vuln/detail/CVE-2022-23516ADVISORY
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