CVE Watch7 oct 2026

CVE-2021-39139

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

Alto

EPSS

4.5%

p92

KEV

—

Exploit Today

0-100

Publicado: 23 ago 2021 · Última mod.: 7 oct 2026 · CWE-434 · CWE-502

EPSS · 30d

4.5%EPSS · 30 días4.5%

2026-10-172026-11-13

Descripción técnica

XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream. A user is only affected if using the version out of the box with JDK 1.7u21 or below. However, this scenario can be adjusted easily to an external Xalan that works regardless of the version of the Java runtime. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose.

Referencias oficiales

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