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Versions prior to 1.4.19 may allow a remote attacker to allocate 100% CPU time on the target system depending on CPU type or parallel execution of such a payload resulting in a denial of service only by manipulating the processed input stream. XStream 1.4.19 monitors and accumulates the time it takes to add elements to collections and throws an exception if a set threshold is exceeded. Users are advised to upgrade as soon as possible. Users unable to upgrade may set the NO_REFERENCE mode to prevent recursion. See GHSA-rmr5-cpv2-vgjf for further details on a workaround if an upgrade is not possible.","XStream is an open source java library to serialize objects to XML and back again. Versions prior to 1.4.19 may allow a remote attacker to allocate 100% CPU 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storage, database connection pool entries, and CPU. If an attacker can trigger the allocation of these limited resources, but the number or size of the resources is not controlled, then the attacker could cause a denial of service that consumes all available resources. This would prevent valid users from accessing the product, and it could potentially have an impact on the surrounding environment. For example, a memory exhaustion attack against an application could slow down the application as well as its host operating system.\nThere are at least three distinct scenarios which can commonly lead to resource exhaustion:\nResource exhaustion problems are often result due to an incorrect implementation of the following situations:","Draft","Class","Simple",1,[],{"title":186,"metaDescription":187,"keywords":188,"canonicalUrl":189,"structuredData":190},"What is CVE-2021-43859? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2021-43859, a high severity cyber security vulnerability from 2022. XStream is an open source java library to serialize objects...","CVE-2021-43859, CVE-2021-43859 vulnerability, CVE-2021-43859 security, high severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research, vulnerability assessment, cyber threats, 2022, CVSS score, exploit, patch, remediation, jenkins security, xstream security, fedoraproject security, debian security, oracle security, jenkins vulnerability, xstream vulnerability, fedora vulnerability","\u002Fwhat-is\u002Fcve-2021-43859",{"@context":191,"@type":192,"headline":186,"description":187,"datePublished":10,"dateModified":11,"author":193,"publisher":197,"about":201,"mainEntityOfPage":205,"articleSection":208,"keywords":209},"https:\u002F\u002Fschema.org","TechArticle",{"@type":194,"name":195,"url":196},"Organization","Precursor 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EPSS score increased by 0.120 on 2023-12-30","EPSS Score Increased","red",{"id":289,"eventType":290,"eventTime":291,"details":292,"label":293,"color":294},"c05c6915-ed96-459f-98d1-da480d56ec04","LOW_EPSS_DELTA","2025-11-22T04:05:41.388564+00:00","Daily EPSS score decreased by 0.120 on 2023-12-30","EPSS Score Decreased","green",{"lastModified":11,"cacheTime":296,"version":37},1792247171286,{"score":298,"band":299,"action":300,"scoredAt":301},50,"Medium","Plan remediation","2026-10-16T06:53:17.553149+00:00"]