Vulnerability · Published Sep 25, 2026 · Assigned by EEF
CVE-2026-92106lazy_html serializes SVG and MathML style and script text unescaped, allowing mutation XSS
Low 2.3
In plain English
A low-severity cross-site scripting in lazy_html from dashbitco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities).
Official 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.
Affected products (as reported)
Weakness: CWE-79 · 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
References
- GitHub Advisory related, vendor-advisory
- EEF CNA record for CVE-2026-92106 related
- OSV record EEF-CVE-2026-92106 related
- Introducing commit 1dee157 in dashbitco/lazy_html related
- Fix commit f32c7fd in dashbitco/lazy_html patch