CVE-2026-44665 fast-xml-builder: Attribute values with unwanted quotes can bypass malicious or unwanted attributes

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 vulnerabili...

CVE-2026-44665 fast-xml-builder: Attribute values with unwanted quotes can bypass malicious or unwanted attributes

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 vulnerabili...

CVE-2026-44665: XML Injection (aka Blind XPath Injection)

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 vulnerabili...

CVE-2026-44664: XML Injection (aka Blind XPath Injection)

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...

GHSA-5WM8-GMM8-39J9 fast-xml-builder allows attribute values with unwanted quotes to bypass malicious or unwanted attributes

Summary 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. Detail Malicious Input a: "@attr": '" onClick="alert1' Output x...

@activepieces/piece-amazon-textract (>=0.2.0, <=0.3.0), @activepieces/piece-salesforce (0.7.2) +4 more potentially affected by CVE-2026-44665 via fast-xml-builder (>=1.1.1, <=1.1.4)

fast-xml-builder NPM version =1.1.1, =0.2.0, =0.2.1, =0.0.4, =10.4.0, =10.5.0 Source cves: CVE-2026-44665 Source advisory: SNYK:JS-FASTXMLBUILDER-16540558...

@activepieces/piece-amazon-textract (>=0.2.0, <=0.3.0), @activepieces/piece-salesforce (0.7.2) +4 more potentially affected by CVE-2026-44665 via fast-xml-builder (>=1.1.1, <=1.1.4)

fast-xml-builder NPM version =1.1.1, =0.2.0, =0.2.1, =0.0.4, =10.4.0, =10.5.0 Source cves: CVE-2026-44665 Source advisory: OSV:GHSA-5WM8-GMM8-39J9...

NPM: fast-xml-builder allows attribute values with unwanted quotes to bypass malicious or unwanted attributes

NPM: fast-xml-builder allows attribute values with unwanted quotes to bypass malicious or unwanted attributes vulnerability discovered by ? in WordPress Npm fast-xml-builder versions = 1.1.6...

fast-xml-builder allows attribute values with unwanted quotes to bypass malicious or unwanted attributes

Summary 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. Detail Malicious Input a: "@attr": '" onClick="alert1' Output x...

XML Injection

Overview Affected versions of this package are vulnerable to XML Injection due to the incomplete sanitization of XML comments. An attacker can inject arbitrary XML or HTML content by including three consecutive dashes in the comment value. Note: This issue was introduced by the fix for...

NPM: fast-xml-builder Comment Value regex can be bypassed

NPM: fast-xml-builder Comment Value regex can be bypassed vulnerability discovered by ? in WordPress Npm fast-xml-builder versions 1.1.5...

CVE-2026-41650

fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. Prior to version 5.7.0, XMLBuilder does not escape the "--" sequence in comment content or the "" sequence in CDATA sections when building XML from JavaScript objects. This allows XML injection...

PT-2026-34614

Name of the Vulnerable Software and Affected Versions fast-xml-parser versions prior to 5.7.0 Description XMLBuilder fails to escape the "--" sequence in comment content and the "" sequence in CDATA sections when generating XML from JavaScript objects. This flaw enables XML injection if...

@activepieces/piece-amazon-textract (>=0.2.0, <=0.3.0), @activepieces/piece-salesforce (0.7.2) +4 more potentially affected by CVE-2026-41650 +1 more via fast-xml-builder (>=1.1.1, <=1.1.4)

fast-xml-builder NPM version =1.1.1, =0.2.0, =0.2.1, =0.0.4, =10.4.0, =10.5.0 Source cves: CVE-2026-41650, CVE-2026-44664 Source advisory: SNYK:JS-FASTXMLBUILDER-16133760...

Stack Overflow

fast-xml-parser is vulnerable to stack overflow vulnerability. The vulnerability is due to improper handling in the XML builder when preserveOrder:true is enabled, which allows an attacker to trigger a stack overflow and crash the application by providing crafted input data...

fast-xml-parser has stack overflow in XMLBuilder with preserveOrder

Impact Application crashes with stack overflow when user use XML builder with prserveOrder:true for following or similar input 'foo': 'bar': '@V': 'baz' Cause: arrToStr was not validating if the input is an array or a string and treating all non-array values as text content. What kind of...

CVE-2026-27942

A flaw was found in fast-xml-parser. A user can exploit this flaw by processing specially crafted XML data with the XML builder when the preserveOrder option is enabled. This can lead to a stack overflow, causing the application to crash and resulting in a Denial of Service DoS. Mitigation To...

UBUNTU-CVE-2026-27942

fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. Prior to version 5.3.8, the application crashes with stack overflow when user use XML builder with preserveOrder:true. Version 5.3.8 fixes the issue. As...

CVE-2026-27942

fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. Prior to version 5.3.8, the application crashes with stack overflow when user use XML builder with preserveOrder:true. Version 5.3.8 fixes the issue. As...

CVE-2026-27942

CVE-2026-27942 affects fast-xml-parser. Before 5.3.8, XMLBuilder with preserveOrder: true can crash with a stack overflow. The issue is fixed in 5.3.8. Workarounds include building XML with preserveOrder: false or validating input data before passing to the builder. Connected sources also referen...