Improper Handling of Case Sensitivity Affecting @xmldom/xmldom package, versions >=0.9.0-beta.1 <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-19499086
- published2 Sept 2026
- disclosed1 Sept 2026
- creditKarimTantawey
Introduced: 1 Sep 2026
NewCVE-2026-83612 (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 Improper Handling of Case Sensitivity via the parseFromString function. An attacker can cause excessive CPU and memory consumption by submitting a specially crafted HTML document with mixed-case closing tags for raw-text elements, leading to output amplification during parsing and serialization.