lazy_html serializes SVG and MathML style and script text unescaped, allowing mutation XSS (CVE-2026-92106) | HOL Guard CVE

Low · CVSS 2.3CVE-2026-92106

lazy_html serializes SVG and MathML style and script text unescaped, allowing mutation XSS

Answer in brief

CVE-2026-92106 records a Low severity (CVSS 2.3) vulnerability in lazy_html serializes SVG and MathML style and script text unescaped, allowing mutation XSS. The current sources do not mark it as known exploited. The current feed maps dashbitco/dashbitco/lazy_html (generic), dashbitco/lazy_html (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: Low · CVSS 2.3
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 2.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps dashbitco/dashbitco/lazy_html (generic), dashbitco/lazy_html (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
dashbitco/dashbitco/lazy_htmlgeneric	>=1dee15746c024916b3110af8b168c2f3b3065fbd <f32c7fd6223225b68bc8691c78b6d4a77972f1d5	f32c7fd6223225b68bc8691c78b6d4a77972f1d5
dashbitco/lazy_htmlgeneric	>=0.1.0 <0.1.13	0.1.13

Recommended response

Check inventory. Check lockfiles and deployed manifests for dashbitco/dashbitco/lazy_html, dashbitco/lazy_html.
Review the reported fix. Update dashbitco/dashbitco/lazy_html to f32c7fd6223225b68bc8691c78b6d4a77972f1d5; dashbitco/lazy_html to 0.1.13 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.