CVE-2026-83612
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module.
Impact
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. parseHtmlSpecialContent, selected by isHTMLRawTextElement or isHTMLEscapableRawTextElement, uses a case-sensitive indexOf() and then calls substring() with a missing-close result of negative one, causing unstable parser progression and quadratic output amplification. A small untrusted text/html document can consequently consume disproportionate CPU and memory when parsed and serialized. This issue is fixed in @xmldom/xmldom version 0.9.12.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @xmldom/xmldom | >= 0.9.0-beta.1, <= 0.9.11 | 0.9.12 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-6mj3-qw4j-hgrw
- https://github.com/xmldom/xmldom/security/advisories/GHSA-6mj3-qw4j-hgrw
- https://nvd.nist.gov/vuln/detail/CVE-2026-83612
- https://github.com/xmldom/xmldom/pull/1071
- https://github.com/xmldom/xmldom/commit/7ced40c06c28d151e996a97045018c3559ae4707
- https://github.com/xmldom/xmldom/releases/tag/0.9.12