CVE-2021-39145: Unrestricted Upload of File with Dangerous Type

August 23, 2021 (updated November 7, 2023)

XStream is a simple library to serialize objects to XML and back again. This vulnerability may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream. Users who followed the recommendation to setup XStream’s security framework with a allow list limited to the minimal required types are not impacted.

References

nvd.nist.gov/vuln/detail/CVE-2021-39145
x-stream.github.io/CVE-2021-39145.html

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