CVE-2026-44665: CWE-91: XML Injection (aka Blind XPath Injection) in NaturalIntelligence fast-xml-builder
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.
AI Analysis
Technical Summary
fast-xml-builder versions before 1.1.7 improperly handle quotes in attribute values when entity processing is disabled, resulting in the attribute value being broken into multiple attributes. This behavior enables XML Injection (CWE-91), also known as Blind XPath Injection, where an attacker can insert unauthorized attributes into the XML or HTML output. The vulnerability is addressed by the vendor in version 1.1.7.
Potential Impact
An attacker can exploit this vulnerability to inject arbitrary attributes into XML or HTML documents generated by fast-xml-builder, potentially leading to unauthorized data manipulation or logic bypass in applications consuming the XML. The CVSS score of 6.1 reflects a medium severity impact with low confidentiality and integrity impact and no availability impact.
Mitigation Recommendations
Upgrade fast-xml-builder to version 1.1.7 or later, where this vulnerability is fixed. No other official remediation or temporary fixes are documented. Patch status is not explicitly confirmed beyond the fixed version, so users should verify the upgrade with the vendor or official sources.
CVE-2026-44665: CWE-91: XML Injection (aka Blind XPath Injection) in NaturalIntelligence fast-xml-builder
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.
CVSS v3.1
Score 6.1medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
fast-xml-builder versions before 1.1.7 improperly handle quotes in attribute values when entity processing is disabled, resulting in the attribute value being broken into multiple attributes. This behavior enables XML Injection (CWE-91), also known as Blind XPath Injection, where an attacker can insert unauthorized attributes into the XML or HTML output. The vulnerability is addressed by the vendor in version 1.1.7.
Potential Impact
An attacker can exploit this vulnerability to inject arbitrary attributes into XML or HTML documents generated by fast-xml-builder, potentially leading to unauthorized data manipulation or logic bypass in applications consuming the XML. The CVSS score of 6.1 reflects a medium severity impact with low confidentiality and integrity impact and no availability impact.
Mitigation Recommendations
Upgrade fast-xml-builder to version 1.1.7 or later, where this vulnerability is fixed. No other official remediation or temporary fixes are documented. Patch status is not explicitly confirmed beyond the fixed version, so users should verify the upgrade with the vendor or official sources.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-07T16:20:08.659Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a04a50ccbff5d8610e804b8
Added to database: 05/13/2026, 16:21:32 UTC
Last enriched: 05/20/2026, 18:25:31 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 107
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