CVE-2026-92106
lazy_html serializes SVG and MathML style and script text unescaped, allowing mutation XSS
- State
- Published
- Severity
- 2.3 Low
- Published
- Sep 25, 2026
- Updated
- Sep 25, 2026
- Reserved
- Sep 21, 2026
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 </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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.3 Low | 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 | EEF |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
lazy_htmldashbitco |
|
lazy_htmldashbitco |
|
References
- GitHub Advisoryrelatedvendor-advisory
- EEF CNA record for CVE-2026-92106related
- OSV record EEF-CVE-2026-92106related
- Introducing commit 1dee157 in dashbitco/lazy_htmlrelated
- Fix commit f32c7fd in dashbitco/lazy_htmlpatch
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