CVE-2026-92106
LowCVSS 2.3Exploitation Probability (EPSS)
Low risk43th percentile - higher than 43% of all known CVEs
Summary
The lazy_html library (versions 0.1.0 through 0.1.13) contains a mutation XSS vulnerability. LazyHTML.to_html/2 and LazyHTML.Tree.to_html/2 decide whether to escape an element's text based solely on its tag name, so style or script elements inside SVG/MathML foreign content are serialized as HTML raw-text elements without escaping. Encoded markup such as </style><img src=x onerror=...> inside <svg><style> closes the element on re-parse and becomes live markup.
Risk Assessment
Applications that parse untrusted HTML with lazy_html, filter the document or tree, and serialize it for display are exposed to execution of malicious script in the user's browser. Because the payload is a plain text node, no element or attribute filter detects it.
Recommendation
Upgrade lazy_html to version 0.1.13 or later. Until then, avoid parsing and re-serializing untrusted HTML that contains SVG/MathML content.
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Original NVD description (English source)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in dashbitco lazy_html allows mutation XSS via a parse and serialize round-trip of attacker-supplied HTML. LazyHTML.to_html/2 and LazyHTML.Tree.to_html/2 decide whether to escape an element's text from its tag name alone. A style or script element inside SVG or MathML foreign content is parsed with character references decoded, but is serialized as an HTML raw-text element, so its text is emitted unescaped. Encoded markup such as </style><img src=x onerror=...> inside <svg><style> therefore closes the element on re-parse and becomes live markup. Applications that parse untrusted HTML with lazy_html, filter the document or tree, and serialize it for display are affected, since the payload is a plain text node that no element or attribute filter sees. This issue affects lazy_html: from 0.1.0 before 0.1.13.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

