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  5. CVE-2021-43859

CVE-2021-43859: Denial of Service by injecting highly recursive collections or maps in XStream

February 1, 2022 (updated November 4, 2025)

The 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.

References

  • github.com/advisories/GHSA-rmr5-cpv2-vgjf
  • github.com/x-stream/xstream
  • github.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd672e0c0c3a846
  • github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjf
  • lists.debian.org/debian-lts-announce/2022/02/msg00018.html
  • lists.debian.org/debian-lts-announce/2024/12/msg00023.html
  • lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VACQYG356OHUTD5WQGAQ4L2TTFTAV3SJ
  • lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XODFRE2ZL64FICBJDOPWOLPTSSAI4U7X
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VACQYG356OHUTD5WQGAQ4L2TTFTAV3SJ
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XODFRE2ZL64FICBJDOPWOLPTSSAI4U7X
  • nvd.nist.gov/vuln/detail/CVE-2021-43859
  • www.oracle.com/security-alerts/cpuapr2022.html
  • www.oracle.com/security-alerts/cpujul2022.html
  • x-stream.github.io/CVE-2021-43859.html

Code Behaviors & Features

Detect and mitigate CVE-2021-43859 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →

Affected versions

All versions before 1.4.19

Fixed versions

  • 1.4.19

Solution

Upgrade to version 1.4.19 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Learn more about CVSS

Weakness

  • CWE-400: Uncontrolled Resource Consumption
  • CWE-502: Deserialization of Untrusted Data

Source file

maven/com.thoughtworks.xstream/xstream/CVE-2021-43859.yml

Spotted a mistake? Edit the file on GitLab.

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