CVE-2020-26217

HIGH8.0EPSS 93.2%

XStream can be used for Remote Code Execution

Published: 11/16/2020Modified: 4/28/2026

Description

XStream before version 1.4.14 is vulnerable to Remote Code Execution.The vulnerability may allow a remote attacker to run arbitrary shell commands only by manipulating the processed input stream. Only users who rely on blocklists are affected. Anyone using XStream's Security Framework allowlist is not affected. The linked advisory provides code workarounds for users who cannot upgrade. The issue is fixed in version 1.4.14.

Affected packages (5)

CVSS scores

SourceVersionSeverityVector
osvCVSS 3.1HIGH8.0CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

References (23)