{"id":"CVE-2026-26278","sourceIdentifier":"security-advisories@github.com","published":"2026-02-19T20:25:43.717","lastModified":"2026-09-10T13:17:56.203","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible to make the parser spend seconds or even minutes processing a single request, effectively freezing the application. Version 5.3.6 fixes the issue. As a workaround, avoid using DOCTYPE parsing by `processEntities: false` option."},{"lang":"es","value":"fast-xml-parser permite a los usuarios validar XML, analizar XML a objeto JS, o construir XML desde objeto JS sin bibliotecas basadas en C/C++ y sin callback. En las versiones 4.1.3 a 5.3.5, el analizador XML puede ser forzado a realizar una cantidad ilimitada de expansión de entidades. Con una entrada XML muy pequeña, es posible hacer que el analizador dedique segundos o incluso minutos a procesar una única solicitud, congelando efectivamente la aplicación. La versión 5.3.6 corrige el problema. Como solución alternativa, evite usar el análisis de DOCTYPE mediante la opción 'processEntities: false'."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"NaturalIntelligence","product":"fast-xml-parser","versions":[{"version":">= 5.0.0, < 5.3.6","status":"affected"},{"version":">= 4.1.3, < 4.5.4","status":"affected"}]}]},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","affectedData":[{"vendor":"Red Hat","product":"Red Hat Advanced Cluster Security 4.8","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"advanced-cluster-security/rhacs-main-rhel8","cpes":["cpe:/a:redhat:advanced_cluster_security:4.8::el8"],"versions":[{"version":"1775594119","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat Advanced Cluster Security 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