XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.15, a Server-Side Forgery Request vulnerability can be activated when unmarshalling. The vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.15. The reported vulnerability does not exist if running Java 15 or higher. No user is affected who followed the recommendation to setup XStream's Security Framework with a whitelist! Anyone relying on XStream's default blacklist can immediately switch to a whilelist for the allowed types to avoid the vulnerability. Users of XStream 1.4.14 or below who still want to use XStream default blacklist can use a workaround described in more detailed in the referenced advisories.
References
History

Fri, 23 May 2025 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache struts
Xstream
Xstream xstream
CPEs cpe:2.3:a:xstream_project:xstream:*:*:*:*:*:*:*:* cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:*
cpe:2.3:a:xstream:xstream:*:*:*:*:*:*:*:*
Vendors & Products Xstream Project
Xstream Project xstream
Apache
Apache struts
Xstream
Xstream xstream

Wed, 15 Jan 2025 20:30:00 +0000


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2020-12-16T01:05:22

Updated: 2025-01-15T20:20:17.971Z

Reserved: 2020-10-01T00:00:00

Link: CVE-2020-26258

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2020-12-16T01:15:12.333

Modified: 2025-05-23T16:53:23.900

Link: CVE-2020-26258

cve-icon Redhat

Severity : Moderate

Publid Date: 2020-12-13T00:00:00Z

Links: CVE-2020-26258 - Bugzilla