VYPR
High severityNVD Advisory· Published Feb 1, 2022· Updated Nov 3, 2025

Denial of Service by injecting highly recursive collections or maps in XStream

CVE-2021-43859

Description

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 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.

AI Insight

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
com.thoughtworks.xstream:xstreamMaven
< 1.4.191.4.19

Affected products

9

Patches

Vulnerability mechanics

References

16

News mentions

1