Bug 2477155 (CVE-2026-44665)

Summary: CVE-2026-44665 fast-xml-builder: fast-xml-builder: Attribute injection leading to information disclosure or content manipulation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: abarbaro, abuckta, alizardo, caswilli, dkuc, dschmidt, erezende, fdeutsch, jchui, jhe, jlanda, kaycoth, kshier, ktsao, manissin, nboldt, oaljalju, orabin, oramraz, psrna, simaishi, smcdonal, smullick, stcannon, stirabos, teagle, thason, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in fast-xml-builder, a software component used to create XML documents from JSON data. This vulnerability allows a remote attacker to inject unauthorized attributes into the generated XML or HTML output. By crafting malicious input that includes quotes in attribute values without proper entity processing, an attacker can manipulate the structure of the output. This could lead to unintended information disclosure or alteration of how content is displayed.
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Description OSIDB Bzimport 2026-05-13 17:01:26 UTC
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.