CVE-2026-41650: medium-severity vulnerability in NaturalIntelligence fast-xml-parser
fast-xml-parser XMLBuilder: XML Comment and CDATA Injection via Unescaped Delimiters
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.1epss 0.2%
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 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
NaturalIntelligence · fast-xml-parserRelated CVEs — NaturalIntelligence fast-xml-parser
In the same product, most dangerous first.
CVE-2023-34104HIGHRegex Injection via Doctype EntitiesEPSS 1.1%CVE-2026-26278HIGHfast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit)EPSS 0.9%CVE-2024-41818HIGHReDOS at currency parsing fast-xml-parserEPSS 0.8%CVE-2026-25128HIGHfast-xml-parser has RangeError DoS Numeric Entities BugEPSS 0.6%CVE-2026-33036HIGHfast-xml-parser affected by numeric entity expansion bypassing all entity expansion limits (incomplete fix for CVE-2026-26278)EPSS 0.6%CVE-2026-27942LOWfast-xml-parser has stack overflow in XMLBuilder with preserveOrderEPSS 0.5%