What’s Vulnerable › Vulnerabilities

CVE-2021-39152: A Server-Side Forgery Request vulnerability in XStream via HashMap unmarshaling

Description

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.

Affected products

How to fix

Upgrade to a fixed version: x-stream xstream 1.4.18. Check the vendor advisory for mitigations.

References

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