fast-xml-parser XMLBuilder: XML Comment and CDATA Injection via Unescaped Delimiters

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Summary

CVECVE-2026-41650
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-07 15:16:07 UTC
Updated2026-05-12 20:30:29 UTC
Descriptionfast-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 when user-controlled data flows into comments or CDATA elements, leading to XSS, SOAP injection, or data manipulation. This issue has been patched in version 5.7.0.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.000290000 probability, percentile 0.082650000 (date 2026-05-12)

Problem Types: CWE-91 | CWE-91 CWE-91: XML Injection (aka Blind XPath Injection)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Naturalintelligence Fast-xml-parser All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA NaturalIntelligence Fast-xml-parser affected < 5.7.0 Not specified

References

ReferenceSourceLinkTags
github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.6.0 [email protected] github.com Product, Release Notes
github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-... 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Mitigation, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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