xmldom prior 0.8.13/0.9.10 internalSubset/publicId/systemId xml injection

Summaryinfo

A vulnerability has been found in xmldom and classified as critical. This impacts an unknown function. This manipulation of the argument internalSubset/publicId/systemId causes xml injection. This vulnerability is tracked as CVE-2026-41674. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in xmldom and classified as critical. Affected by this vulnerability is an unknown part. The manipulation of the argument internalSubset/publicId/systemId with an unknown input leads to a xml injection vulnerability. The CWE definition for the vulnerability is CWE-91. The product does not properly neutralize special elements that are used in XML, allowing attackers to modify the syntax, content, or commands of the XML before it is processed by an end system. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and `XMLSerializer` module. In @xmldom/xmldom prior to versions 0.9.10 and 0.8.13 and xmldom version 0.6.0 and prior, the package serializes DocumentType node fields (internalSubset, publicId, systemId) verbatim without any escaping or validation. When these fields are set programmatically to attacker-controlled strings, XMLSerializer.serializeToString can produce output where the DOCTYPE declaration is terminated early and arbitrary markup appears outside it. This issue has been patched in versions @xmldom/xmldom versions 0.9.10 and 0.8.13.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-41674 since 04/22/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1505 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 313072 (Linux Distros Unpatched Vulnerability : CVE-2026-41674), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.8.13 or 0.9.10 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 372008f9ae0e20fd69f761c7b79e202598267314 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (313072). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• xmldom

License

• open-source

Website

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

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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