CVE Watch7 oct 2026

CVE-2021-21342

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

CVSS

5.3

Medio

EPSS

50.0%

p99

KEV

—

Exploit Today

0-100

Publicado: 23 mar 2021 · Última mod.: 7 oct 2026 · CWE-502 · CWE-918

EPSS · 30d

50.0%EPSS · 30 días50.0%

2026-09-232026-10-20

Descripción técnica

XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability where the processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in a server-side forgery request. 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.

Referencias oficiales

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