XML Injection Affecting @xmldom/xmldom package, versions >=0.9.0 <0.9.12
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-XMLDOMXMLDOM-19499073
- published2 Sept 2026
- disclosed1 Sept 2026
- creditChristian Bewernitz
Introduced: 1 Sep 2026
NewCVE-2026-83609 (opens in a new tab)How to fix?
Upgrade @xmldom/xmldom to version 0.9.12 or higher.
Overview
@xmldom/xmldom is a javascript ponyfill to provide the following APIs that are present in modern browsers to other runtimes. Since version 0.7.0 this package is published to npm as @xmldom/xmldom and no longer as xmldom
Affected versions of this package are vulnerable to XML Injection via the reg() function in lib/grammar.js, which compiled all anchored validation regexes with the m (multiline) flag. Because ^…$ anchors match per-line when m is set, a name or ID value containing an ECMAScript line terminator (U+000A, U+000D, U+2028, or U+2029) passes full-string validation as long as its first line is conformant, allowing arbitrary trailing markup to bypass well-formedness checks. An attacker can supply element names, attribute names, or DOCTYPE publicId/systemId values containing embedded line terminators to inject content that evades the validators enforced by createElementNS, createAttributeNS, createDocumentType, createAttribute, and serializeToString with requireWellFormed: true.