fast-xml-builder builds XML from JSON. Prior to 1.1.7, when an input data has quotes in attribute values but process entities is not enabled, it breaks the attribute value into multiple attributes. This gives the room for an attacker to insert unwanted attributes to the XML/HTML. This vulnerability is fixed in 1.1.7.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-5wm8-gmm8-39j9 fast-xml-builder allows attribute values with unwanted quotes to bypass malicious or unwanted attributes
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 20 May 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 18 May 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 14 May 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Naturalintelligence
Naturalintelligence fast-xml-builder
Vendors & Products Naturalintelligence
Naturalintelligence fast-xml-builder

Wed, 13 May 2026 16:15:00 +0000

Type Values Removed Values Added
Description fast-xml-builder builds XML from JSON. Prior to 1.1.7, when an input data has quotes in attribute values but process entities is not enabled, it breaks the attribute value into multiple attributes. This gives the room for an attacker to insert unwanted attributes to the XML/HTML. This vulnerability is fixed in 1.1.7.
Title fast-xml-builder: Attribute values with unwanted quotes can bypass malicious or unwanted attributes
Weaknesses CWE-91
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-18T15:04:53.679Z

Reserved: 2026-05-07T16:20:08.659Z

Link: CVE-2026-44665

cve-icon Vulnrichment

Updated: 2026-05-18T15:04:10.749Z

cve-icon NVD

Status : Deferred

Published: 2026-05-13T16:16:59.093

Modified: 2026-05-18T16:16:31.700

Link: CVE-2026-44665

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-05-13T15:24:54Z

Links: CVE-2026-44665 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-05-14T14:34:15Z

Weaknesses