CVE-2026-44664: CWE-91: XML Injection (aka Blind XPath Injection) in NaturalIntelligence fast-xml-builder
fast-xml-builder builds XML from JSON. In 1.1.5, the fix for CVE-2026-41650 in fast-xml-parser sanitizes -- sequences in XML comment content using .replace(/--/g, '- -'). This skip the values containing three consecutive dashes (e.g., --->...), allowing an attacker to break out of an XML comment and inject arbitrary XML/HTML content. This vulnerability is fixed in 1.1.6.
AI Analysis
Technical Summary
fast-xml-builder version 1.1.5 contains an XML Injection vulnerability (CWE-91) due to incomplete sanitization of dash sequences in XML comments. The prior fix replaced double dashes with spaced dashes but did not address sequences of three or more dashes (e.g., '--->'), which can be exploited to break out of XML comments and inject arbitrary XML or HTML content. This can lead to partial compromise of data integrity and confidentiality. The issue is resolved in version 1.1.6.
Potential Impact
An attacker can exploit this vulnerability to inject arbitrary XML or HTML content by breaking out of XML comments. This can lead to limited confidentiality and integrity impacts, as indicated by the CVSS vector (Confidentiality: Low, Integrity: Low, Availability: None). There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade fast-xml-builder to version 1.1.6 or later where this vulnerability is fixed. Patch status is not explicitly confirmed via vendor advisory, but the description states the issue is fixed in 1.1.6. Until upgrading, avoid processing untrusted input with version 1.1.5 to mitigate risk.
CVE-2026-44664: CWE-91: XML Injection (aka Blind XPath Injection) in NaturalIntelligence fast-xml-builder
Description
fast-xml-builder builds XML from JSON. In 1.1.5, the fix for CVE-2026-41650 in fast-xml-parser sanitizes -- sequences in XML comment content using .replace(/--/g, '- -'). This skip the values containing three consecutive dashes (e.g., --->...), allowing an attacker to break out of an XML comment and inject arbitrary XML/HTML content. This vulnerability is fixed in 1.1.6.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
fast-xml-builder version 1.1.5 contains an XML Injection vulnerability (CWE-91) due to incomplete sanitization of dash sequences in XML comments. The prior fix replaced double dashes with spaced dashes but did not address sequences of three or more dashes (e.g., '--->'), which can be exploited to break out of XML comments and inject arbitrary XML or HTML content. This can lead to partial compromise of data integrity and confidentiality. The issue is resolved in version 1.1.6.
Potential Impact
An attacker can exploit this vulnerability to inject arbitrary XML or HTML content by breaking out of XML comments. This can lead to limited confidentiality and integrity impacts, as indicated by the CVSS vector (Confidentiality: Low, Integrity: Low, Availability: None). There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade fast-xml-builder to version 1.1.6 or later where this vulnerability is fixed. Patch status is not explicitly confirmed via vendor advisory, but the description states the issue is fixed in 1.1.6. Until upgrading, avoid processing untrusted input with version 1.1.5 to mitigate risk.
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: 6a04a50ccbff5d8610e804b5
Added to database: 5/13/2026, 4:21:32 PM
Last enriched: 5/13/2026, 4:36:47 PM
Last updated: 5/13/2026, 5:27:16 PM
Views: 2
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