xmldom up to 0.8.14 Parser lib/sax.js DOMParser.parseFromString resource consumption

Summaryinfo

A vulnerability marked as problematic has been reported in xmldom up to 0.8.14. This issue affects the function DOMParser.parseFromString of the file lib/sax.js of the component Parser. The manipulation leads to resource consumption. This vulnerability is traded as CVE-2026-83619. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in xmldom up to 0.8.14. It has been rated as problematic. This issue affects the function DOMParser.parseFromString of the file lib/sax.js of the component Parser. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.7.0 until 0.8.15, the release-0.8.x parser in lib/sax.js trims captured end-tag names with the unanchored global expression /[ \t\n\r]+$/g. For an end tag containing a long whitespace run followed by a non-whitespace character, the expression retries from each possible starting position and backtracks quadratically before failing its end anchor. DOMParser.parseFromString() reaches the path under default options, allowing a small unauthenticated XML input to stall the Node.js event loop; the 0.9.x and unscoped npm lines do not contain this expression. This issue is fixed in @xmldom/xmldom version 0.8.15.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-83619 since 08/31/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 0.8.15 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

Website

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

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