CVE-2026-44664— fast-xml-builder: Comment Value bypass regex
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-parser是Natural Intelligence开源的一个库。用于在没有基于 C/C++ 的库和回调的情况下，快速验证 XML、解析 XML 和构建 XML。 fast-xml-parser 1.1.5版本存在安全漏洞，该漏洞源于修复CVE-2026-41650时对XML注释内容中--序列的清理不完整，允许攻击者跳出XML注释注入任意XML或HTML内容。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| NaturalIntelligence | fast-xml-builder | 1.1.5 |
affected |
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I. Basic Information for CVE-2026-44664
Vulnerability Information
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Vulnerability Title
fast-xml-builder: Comment Value bypass regex
Source: CVE Program / CVE List V5
Vulnerability 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.
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-parser 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
fast-xml-parser是Natural Intelligence开源的一个库。用于在没有基于 C/C++ 的库和回调的情况下，快速验证 XML、解析 XML 和构建 XML。 fast-xml-parser 1.1.5版本存在安全漏洞，该漏洞源于修复CVE-2026-41650时对XML注释内容中--序列的清理不完整，允许攻击者跳出XML注释注入任意XML或HTML内容。
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 | 1.1.5 | - |
|
II. Public POCs for CVE-2026-44664
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-44664 (1)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-44664
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