CVE-2021-39150

8.5 highEPSS 3.4%

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.

CVSS 3.1: 8.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS: 3.4% chance of exploitation in the next 30 days; higher than 88% of CVEs (scores of 2026-10-25)
CWEs: CWE-502, CWE-918
Published: 2021-08-23
Modified: 2026-10-07
Record from: the NVD, synced 2026-10-19

Affected

debian:debian_linux
fedoraproject:fedora
netapp:snapmanager
oracle:business_activity_monitoring
oracle:commerce_guided_search
oracle:communications_billing_and_revenue_management_elastic_charging_engine
oracle:communications_cloud_native_core_automated_test_suite
oracle:communications_cloud_native_core_binding_support_function
oracle:communications_cloud_native_core_policy
oracle:communications_unified_inventory_management
oracle:retail_xstore_point_of_service
oracle:utilities_framework
oracle:utilities_testing_accelerator
oracle:webcenter_portal
xstream:xstream

Packages (OSV)

Advisory	Ecosystem	Package	Affected	Fixed in
GHSA-cxfm-5m4g-x7xp	Maven	com.thoughtworks.xstream:xstream	<1.4.18	1.4.18

References

Check your stack JSON