CVE WatchOct 7, 2026

CVE-2021-21341

XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is vulnerability which may all

CVSS

7.5

High

EPSS

77.8%

p100

KEV

—

Exploit Today

0-100

Published: Mar 23, 2021 · Last modified: Oct 7, 2026 · CWE-400 · CWE-502

EPSS · 30d

77.8%EPSS · 30 days77.8%

2026-09-222026-10-20

Technical description

XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is vulnerability which 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. No user is affected who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.

Official references

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