{"id":"CVE-2026-126205","summary":"Loofah: Regular expression denial of service in the SVG local-reference check","details":"Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Prior to 2.25.3, the Loofah HTML5 sanitizer checks href and xlink:href on elements in SVG_ALLOW_LOCAL_HREF with a regular expression whose line anchor and newline-matching whitespace cause an all-whitespace value to be rescanned from every line start. An attacker can submit an SVG reference element with a long multiline-whitespace attribute and consume CPU quadratically during sanitization. CRuby 3.1 and earlier and JRuby are affected, while CRuby 3.2 and later uses linear-time regular-expression matching. The default safelist reaches the vulnerable check without a configuration change. This issue is fixed in version 2.25.3.","aliases":["GHSA-mf2j-8f84-cc9q"],"modified":"2026-11-13T10:46:29.589670995Z","published":"2026-11-12T20:41:25.574Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126205.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-1333","CWE-400"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126205.json"},{"type":"FIX","url":"https://github.com/flavorjones/loofah/commit/2f31e7fae36036c9882d3d0fae720e1014c57cd1"},{"type":"FIX","url":"https://github.com/flavorjones/loofah/pull/324"},{"type":"WEB","url":"https://github.com/flavorjones/loofah/releases/tag/v2.25.3"},{"type":"ADVISORY","url":"https://github.com/flavorjones/loofah/security/advisories/GHSA-mf2j-8f84-cc9q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126205"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/flavorjones/loofah","events":[{"introduced":"0"},{"fixed":"bbe007e52e8aeaa520b3e515235d467f5b1416e6"},{"fixed":"2f31e7fae36036c9882d3d0fae720e1014c57cd1"}],"database_specific":{"extracted_events":[{"strategy":"StringRangeExpression","range":[{"introduced":"0"},{"fixed":"2.25.3"}],"source":"AFFECTED_FIELD"},{"range":[{"fixed":"2f31e7fae36036c9882d3d0fae720e1014c57cd1"}],"source":"REFERENCES_COMMIT"},{"original_tag":"v2.25.3","range":[{"fixed":"bbe007e52e8aeaa520b3e515235d467f5b1416e6"}],"source":"REFERENCES_TAG"}]}}],"versions":["v2.25.2","v2.25.1","v2.25.0","v2.24.1","v2.24.0","v2.23.1","v2.23.0","v2.22.0","v2.21.4","v2.21.3","v2.21.2","v2.21.1","v2.21.0","v2.21.0.rc1","v2.20.0","v2.19.0","v2.18.0","v2.17.0","v2.16.0","v2.15.0","v2.14.0","v2.13.0","v2.12.0","v2.11.0","v2.10.0","v2.9.1","v2.9.0","v2.8.0","v2.7.0","v2.6.0","v2.5.0","v2.4.0","v2.3.1","v2.3.0","v2.2.2","v2.2.1","v2.2.0","v2.1.1","v2.1.0","v2.1.0.rc2","v2.1.0.rc1","v2.0.3","v2.0.2","v2.0.1","v2.0.0","v1.2.1","v1.2.0","v1.1.0","v1.0.0","v1.0.0.beta.1","v0.4.7","v0.4.6","v0.4.5","v0.4.4","v0.4.3","v0.4.2","v0.4.1","v0.4.0","v0.3.1","v0.3.0","v0.2.2","v0.2.1","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126205.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}