CVE-2021-39144

x-stream xstream

Published 23 Aug 2021 · updated 17 Jun 2026 · Analyzed

8.5 High · CVSS 3.1, NVD

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 10 Mar 2023, with a remediation deadline of 31 Mar 2023 for US federal agencies.

Required action: Apply updates per vendor instructions.

Description

XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker has sufficient rights to execute commands of the 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. XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose.

References