x-stream · xstream
A Server-Side Request Forgery flaw in XStream's HashMap unmarshaling, which is the XML-to-object deserialization component of the XStream serialization library.
XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime version 14 to 8. 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](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.18.
First seen exploited 4 years after disclosure.
No ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.
1 package in 1 ecosystem. Main package: com.thoughtworks.xstream:xstream.
Upgrade to 1.4.18 or later
Fixes this CVE and 12 other known vulnerabilities in this package (CVE-2013-7285, CVE-2019-10173, +10).
Set the version to 1.4.18 or later in your pom.xml or build.gradle.
The first fix for CVE-2021-39152.
| If you run | Upgrade to |
|---|---|
| All versions before 1.4.18 | 1.4.18 |
“Up to” means the second version is the fix and is not affected.