{"id":"CVE-2022-23516","aliases":["GHSA-3x8r-x6xp-q4vm"],"url":"https://o3.security/vulnerability/CVE-2022-23516","summary":"Uncontrolled Recursion in Loofah","details":"## Summary\n\nLoofah `>= 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.\n\n\n## Mitigation\n\nUpgrade to Loofah `>= 2.19.1`.\n\nUsers who are unable to upgrade may be able to mitigate this vulnerability by limiting the length of the strings that are sanitized.\n\n\n## Severity\n\nThe 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).\n\n\n## References\n\n- [CWE - CWE-674: Uncontrolled Recursion (4.9)](https://cwe.mitre.org/data/definitions/674.html)","published":"2022-12-14T13:26:11.741Z","modified":"2026-08-12T03:51:20.407713650Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"RubyGems","name":"loofah","fixedVersion":"2.19.1"}],"fix":{"url":"https://github.com/flavorjones/loofah/commit/86f7f6364491b0099d215db858ecdc0c89ded040","label":"flavorjones/loofah@86f7f63"},"references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/09/msg00011.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/09/msg00044.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/23xxx/CVE-2022-23516.json"},{"type":"ADVISORY","url":"https://github.com/flavorjones/loofah/security/advisories/GHSA-3x8r-x6xp-q4vm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-23516"},{"type":"WEB","url":"https://github.com/flavorjones/loofah/commit/86f7f6364491b0099d215db858ecdc0c89ded040"},{"type":"PACKAGE","url":"https://github.com/flavorjones/loofah"},{"type":"WEB","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/loofah/CVE-2022-23516.yml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:20.407713650Z"}}