xmldom: HTML raw-text closing-tag case mismatch causes output amplification

Summary In HTML mode text/html, a raw-text element script, style, textarea, title whose closing tag differs in case from its opening tag e.g. for is mishandled by the parser, producing quadratic On² output growth — a small crafted document parses and serializes into output orders of magnitude...

CVE-2026-83612

xmldom is a pure JavaScript DOMParser and XMLSerializer module. In versions from 0.9.0-beta.1 up to the fix in 0.9.12 , HTML-mode parsing via DOMParser.parseFromString() mishandles mixed-case closing tags for raw-text elements (script, style, textarea, title). The root cause is that parseHtmlSpec...

CVE-2026-83612

xmldom is a pure JavaScript W3C standard-based XML DOM Level 2 Core DOMParser and XMLSerializer module. From 0.9.0-beta.1 until 0.9.12, HTML-mode parsing through DOMParser.parseFromString mishandles a mixed-case closing tag for the script, style, textarea, or title raw-text elements...

Incorrect handling of embedded SVG and MathML leads to mutation XSS after removal

Affected versions of this crate did not correctly strip namespace-incompatible tags in certain situations, causing it to incorrectly account for differences between HTML, SVG, and MathML. This vulnerability only has an effect when the svg or math tag is allowed, because it relies on a tag being...