CVE WatchOct 7, 2026

CVE-2021-39152

XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker

CVSS

8.5

High

EPSS

11.4%

p96

KEV

—

Exploit Today

0-100

Published: Aug 23, 2021 · Last modified: Oct 7, 2026 · CWE-502 · CWE-918

EPSS · 30d

11.4%EPSS · 30 days11.4%

2026-09-282026-10-26

Technical description

XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime version 14 to 8. 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](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.18.

Official references

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