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Vulnerability record · CVE-2021-43859 · published 1 February 2022

CVE-2021-43859: Jenkins uncontrolled resource consumption vulnerability

Jenkins · Jenkins

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.

7.5 CVSS 3.1 High EPSS 7.9% · top 5.5% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score, v2 5.0
7.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
11Affected product versions listed by NVD
19References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

11 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2022/02/09/1 Mailing ListThird Party Advisory
https://github.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd672e0c0c3a846 PatchThird Party Advisory
https://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjf ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/02/msg00018.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VACQYG356OHUTD5WQGAQ4L2 Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XODFRE2ZL64FICBJDOPWOLP Mailing List
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html PatchThird Party Advisory
https://x-stream.github.io/CVE-2021-43859.html ExploitVendor Advisory
http://www.openwall.com/lists/oss-security/2022/02/09/1 Mailing ListThird Party Advisory
https://github.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd672e0c0c3a846 PatchThird Party Advisory
https://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjf ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/02/msg00018.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/12/msg00023.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VACQYG356OHUTD5WQGAQ4L2 Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XODFRE2ZL64FICBJDOPWOLP Mailing List
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html PatchThird Party Advisory
https://x-stream.github.io/CVE-2021-43859.html ExploitVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-43859), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.