GHSA-8whx-365g-h9vv: Loofah `allowed_uri?` does not detect `javascript:` URIs split by named whitespace character references

July 21, 2026 (updated August 12, 2026)

Loofah::HTML5::Scrub.allowed_uri? does not correctly reject javascript: URIs when the scheme is split or prefixed by the HTML5 named character references &Tab; (tab) or &NewLine; (line feed).

References

github.com/advisories/GHSA-8whx-365g-h9vv
github.com/flavorjones/loofah/commit/5e91af861e3cdab47b91dd0b81f3afdfd13a5e19
github.com/flavorjones/loofah/releases/tag/v2.25.2
github.com/flavorjones/loofah/security/advisories/GHSA-8whx-365g-h9vv
nvd.nist.gov/vuln/detail/CVE-2026-73491

Code Behaviors & Features

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