Description
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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| xmldom | xmldom | >= 0.9.0-beta.1, < 0.9.12 | — |
| @xmldom | xmldom | >= 0.9.0-beta.1, < 0.9.12 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | node-xmldom | 0.9.12-1 | — |
| Debian 13 | node-xmldom | No fix yet | — |
| Debian 12 | node-xmldom | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | node-xmldom | No fix yet | — |
| Ubuntu 26.04 LTS | node-xmldom | No fix yet | — |
| Ubuntu 24.04 LTS | node-xmldom | No fix yet | — |
| Ubuntu 22.04 LTS | node-xmldom | No fix yet | — |
| Ubuntu 20.04 LTS | node-xmldom | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | @xmldom/xmldom | >= 0.9.0-beta.1, < 0.9.12 | 0.9.12 | GHSA-6mj3-qw4j-hgrw |
Advisories 1
- WID-SEC-2026-3596 IBM App Connect Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026