CVE-2026-44665

Summary of CVE-2026-44665 details (from provided sources): The vulnerability affects the fast-xml-builder library, where input data containing quotes in attribute values, if the processEntities flag is not enabled, can cause an attribute value to be split into multiple attributes. This enables an...

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...

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...

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...

PT-2026-39287

Name of the Vulnerable Software and Affected Versions fast-xml-builder versions prior to 1.1.7 Description When input data contains quotes in attribute values and the processEntities flag is disabled, the software incorrectly splits the attribute value into multiple attributes. This allows an...

Improper Validation of Specified Quantity in Input

Overview org.webjars.npm:fast-xml-parser is a Validate XML, Parse XML, Build XML without C/C++ based libraries Affected versions of this package are vulnerable to Improper Validation of Specified Quantity in Input in the DocTypeReader component when the maxEntityCount or maxEntitySize configurati...

📄 fast-xml-parser REGEX Injection / Cross Site Scripting

fast-xml-parser versions starting at 4.1.3 and below 5.3.5 suffer from a REGEX injection issue that can allow for cross site scripting attacks. ============================================================================================================================================= | Title :...

XML Entity Expansion

Overview fast-xml-parser is a Validate XML, Parse XML, Build XML without C/C++ based libraries Affected versions of this package are vulnerable to XML Entity Expansion in replaceEntitiesValue when handling excessive DOCTYPE input. An attacker can cause excessive resource consumption and make the...

PT-2023-24675

Name of the Vulnerable Software and Affected Versions fast-xml-parser versions prior to 4.2.4 Description The issue allows special characters in entity names, which are not escaped or sanitized. This can be abused for denial of service DoS attacks by crafting an entity name that results in an...