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Vulnerabilities

Vulnerability · CVE-2021-43859

XStream is an open source java library to serialize objects to XML and back again.

Published Feb 1, 2022 · catalog updated Jun 17, 2026 · XStream is an open

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2021-43859. EPSS is 7.93%. Act only if a listed version of XStream is an open is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (XStream is an open).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
7.93%
Remediation
Version ranges on file
Affected products
cpe debian/debian linux · cpe jenkins/jenkins · cpe oracle/commerce guided search · cpe oracle/communications brm - elastic charging engine · cpe xstream/xstream

XStream is an open source java library to serialize objects to XML and back again. Versions prior to 1.4.19 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. XStream 1.4.19 monitors and accumulates the time it takes to add elements to collections and throws an exception if a set threshold is exceeded. Users are advised to upgrade as soon as possible. Users unable to upgrade may set the NO_REFERENCE mode to prevent recursion. See GHSA-rmr5-cpv2-vgjf for further details on a workaround if an upgrade is not possible.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe debian/debian linux9.0
  • cpe jenkins/jenkins< 2.319.3
  • cpe jenkins/jenkins< 2.334
  • cpe oracle/commerce guided search11.3.2
  • cpe oracle/communications brm - elastic charging engine< 12.0.0.4.6
  • cpe xstream/xstream< 1.4.19

How to fix CVE-2021-43859

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-43859. EPSS is 7.93%. Act only if a listed version of XStream is an open is installed.

Which versions are affected?

Compare what you have installed with debian/debian linux 9.0; oracle/commerce guided search 11.3.2; oracle/communications brm - elastic charging engine < 12.0.0.4.6. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-400: Uncontrolled Resource Consumption. EPSS 7.93%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Jenkins security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 1, 2022 · Monitored products — critical

    Detected

    XStream is an open source java library to serialize objects to XML and back again. Versions prior to 1.4.19 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. XStream 1.4.19 monitors and accumulates the time it takes to add elements

  2. Jun 17, 2026 · Monitored products — critical

    Updated

    XStream is an open source java library to serialize objects to XML and back again. Versions prior to 1.4.19 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. XStream 1.4.19 monitors and accumulates the time it takes to add elements

Sources

  • CVE.orgVulnerability recordCVE-2021-43859

    Official CVE identifier

    cve.org
  • Monitored products — criticalVendor advisoryCVE-2021-43859

    XStream is an open source java library to serialize objects to XML and back again. Versions prior to 1.4.19 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. XStream 1.4.19 monitors and accumulates the time it takes to add elements

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • Monitored products — criticalNov 3, 2026