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 &lt;/style&gt;&lt;img src=x onerror=...&gt; 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.
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Solution

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Workaround

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History

Fri, 25 Sep 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 25 Sep 2026 09:45:00 +0000

Type Values Removed Values Added
Description 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 &lt;/style&gt;&lt;img src=x onerror=...&gt; 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.
Title lazy_html serializes SVG and MathML style and script text unescaped, allowing mutation XSS
First Time appeared Dashbitco
Dashbitco lazy Html
Weaknesses CWE-79
CPEs cpe:2.3:a:dashbitco:lazy_html:*:*:*:*:*:*:*:*
Vendors & Products Dashbitco
Dashbitco lazy Html
References
Metrics cvssV4_0

{'score': 2.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: EEF

Published:

Updated: 2026-09-25T12:41:30.597Z

Reserved: 2026-09-21T12:15:01.326Z

Link: CVE-2026-92106

cve-icon Vulnrichment

Updated: 2026-09-25T12:40:45.313Z

cve-icon NVD

Status : Deferred

Published: 2026-09-25T10:17:08.263

Modified: 2026-09-25T13:22:04.673

Link: CVE-2026-92106

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-25T11:15:05Z

Weaknesses