CVE-2026-44665

fast-xml-builder: Attribute values with unwanted quotes can bypass malicious or unwanted attributes

Published May 13, 2026 CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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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
History
Type Values Removed Values Added
Metrics ssvc

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

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
May 18, 2026, 3:04 PM
Reserved
May 7, 2026, 4:20 PM
Status
Deferred
Published
May 13, 2026, 4:16 PM
Modified
Oct 26, 2026, 6:10 PM
Severity
Moderate
Public date
May 13, 2026, 3:24 PM