CVE WatchOct 7, 2026

CVE-2021-21344

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

CVSS

5.3

Medium

EPSS

76.0%

p100

KEV

—

Exploit Today

0-100

Published: Mar 23, 2021 · Last modified: Oct 7, 2026 · CWE-434 · CWE-502

EPSS · 30d

76.0%EPSS · 30 days76.0%

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 a vulnerability which may allow a remote attacker to load and execute arbitrary code from a remote host 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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