xmldom up to 0.8.14/0.9.11 End-Tag Validator lib/sax.js DOMParser.parseFromString input validation

Summaryinfo

A vulnerability was found in xmldom up to 0.8.14/0.9.11 and classified as problematic. Impacted is the function DOMParser.parseFromString of the file lib/sax.js of the component End-Tag Validator. Such manipulation leads to input validation. This vulnerability is listed as CVE-2026-83611. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in xmldom up to 0.8.14/0.9.11 and classified as problematic. Affected by this issue is the function DOMParser.parseFromString of the file lib/sax.js of the component End-Tag Validator. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is integrity, and availability. CVE summarizes:

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, DOMParser.parseFromString() can silently accept an end tag such as </a\njunk>, close the element, and discard the trailing content. On 0.9.x, the lib/sax.js end-tag validator inherits the multiline flag from reg(), allowing the first line to satisfy the anchored XML ETag production; older lines have no equivalent residue validation. This parser differential can bypass a parse-before-trust well-formedness gate, although it does not inject the discarded content; onError on 0.9.x and errorHandler on 0.8.x are the relevant reporting interfaces. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-83611 since 08/31/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available.

Upgrading to version 0.8.15 or 0.9.12 eliminates this vulnerability.

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Productinfo

Name

• xmldom

Version

• 0.8.0
• 0.8.1
• 0.8.2
• 0.8.3
• 0.8.4
• 0.8.5
• 0.8.6
• 0.8.7
• 0.8.8
• 0.8.9
• 0.8.10
• 0.8.11
• 0.8.12
• 0.8.13
• 0.8.14
• 0.9.0
• 0.9.1
• 0.9.2
• 0.9.3
• 0.9.4
• 0.9.5
• 0.9.6
• 0.9.7
• 0.9.8
• 0.9.9
• 0.9.10
• 0.9.11

Website

• Product: https://github.com/xmldom/xmldom/

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