CVE-2026-44665— fast-xml-builder: Attribute values with unwanted quotes can bypass malicious or unwanted attributes
Quick assessment
Affected
NaturalIntelligence fast-xml-builder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
fast-xml-builder是Natural Intelligence开源的一个将JSON数据转换为XML格式的构建工具。 fast-xml-builder 1.1.7之前版本存在安全漏洞，该漏洞源于输入数据在属性值中有引号但未启用处理实体时，将属性值拆分为多个属性，可能导致攻击者插入不需要的属性到XML或HTML。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| NaturalIntelligence | fast-xml-builder | < 1.1.7 |
affected |
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I. Basic Information for CVE-2026-44665
Vulnerability Information
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Vulnerability Title
fast-xml-builder: Attribute values with unwanted quotes can bypass malicious or unwanted attributes
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
XML注入(XPath盲注)
Source: CVE Program / CVE List V5
Vulnerability Title
fast-xml-builder 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
fast-xml-builder是Natural Intelligence开源的一个将JSON数据转换为XML格式的构建工具。 fast-xml-builder 1.1.7之前版本存在安全漏洞，该漏洞源于输入数据在属性值中有引号但未启用处理实体时，将属性值拆分为多个属性，可能导致攻击者插入不需要的属性到XML或HTML。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| NaturalIntelligence | fast-xml-builder | < 1.1.7 | - |
|
II. Public POCs for CVE-2026-44665
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-44665 (1)
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V. Comments for CVE-2026-44665
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