CVE-2021-39140

XStream can cause a Denial of Service

Published Aug 23, 2021 CVSS 3.1 · 6.5 Medium EPSS 5.9% KEV · Not listed
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 allocate 100% CPU time on the target system depending on CPU type or parallel execution of such a payload resulting in a denial of service only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-2769-1 libxstream-java security update
Debian DSA Debian DSA DSA-5004-1 libxstream-java security update
EUVD EUVD EUVD-2021-1605 XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to allocate 100% CPU time on the target system depending on CPU type or parallel execution of such a payload resulting in a denial of service only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose.
Github GHSA Github GHSA GHSA-6wf9-jmg9-vxcc XStream can cause a Denial of Service
Ubuntu USN Ubuntu USN USN-5946-1 XStream vulnerabilities
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Oct 7, 2026, 8:00 PM
Reserved
Aug 16, 2021, 12:00 AM
Status
Analyzed
Published
Aug 23, 2021, 7:15 PM
Modified
Oct 7, 2026, 9:17 PM
Severity
Moderate
Public date
Aug 22, 2021, 12:00 AM