{ "containers": { "cna": { "affected": [ { "collectionURL": "https://github.com/libexpat/libexpat/", "packageName": "libexpat", "defaultStatus": "unaffected", "versions": [ { "status": "affected", "version": "0", "lessThan": "2.4.0", "versionType": "semver" } ] } ], "datePublic": "2013-02-21T00:00:00.000Z", "descriptions": [ { "lang": "en", "value": "expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function, which allows remote attackers to cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read arbitrary files via a crafted XML document, aka an XML External Entity (XXE) issue. 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