CVE-2026-126205
- Source
- https://cve.org/CVERecord?id=CVE-2026-126205
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126205.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-126205
- Aliases
- Downstream
- Published
- 2026-11-12T20:41:25Z
- Modified
- 2026-11-13T10:46:29Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
- 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.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-1333", "CWE-400" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126205.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126205.json
- https://github.com/flavorjones/loofah/commit/2f31e7fae36036c9882d3d0fae720e1014c57cd1
- https://github.com/flavorjones/loofah/pull/324
- https://github.com/flavorjones/loofah/releases/tag/v2.25.3
- https://github.com/flavorjones/loofah/security/advisories/GHSA-mf2j-8f84-cc9q
- https://nvd.nist.gov/vuln/detail/CVE-2026-126205
Affected packages
Git / github.com/flavorjones/loofah
Affected ranges
- Type
- GIT
- Repo
- https://github.com/flavorjones/loofah
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "0" }, { "fixed": "2.25.3" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "fixed": "2f31e7fae36036c9882d3d0fae720e1014c57cd1" } ], "source": "REFERENCES_COMMIT" }, { "original_tag": "v2.25.3", "range": [ { "fixed": "bbe007e52e8aeaa520b3e515235d467f5b1416e6" } ], "source": "REFERENCES_TAG" } ] }