{"cve":"CVE-2021-43859","nvd":{"published":"2022-02-01T12:15:08.080","modified":"2026-06-17T04:11:35.370","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400"],"references":["http://www.openwall.com/lists/oss-security/2022/02/09/1","https://github.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd672e0c0c3a846","https://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjf","https://lists.debian.org/debian-lts-announce/2022/02/msg00018.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VACQYG356OHUTD5WQGAQ4L2TTFTAV3SJ/"],"products":["debian:debian_linux","fedoraproject:fedora","jenkins:jenkins","oracle:commerce_guided_search","oracle:communications_brm_-_elastic_charging_engine","oracle:communications_cloud_native_core_automated_test_suite","oracle:communications_diameter_intelligence_hub","oracle:communications_policy_management","oracle:flexcube_private_banking","oracle:retail_xstore_point_of_service","xstream:xstream"],"source":"nvd","synced_at":"2026-10-19T21:27:20.926095847+00:00"},"epss":{"cve":"CVE-2021-43859","score":0.07934,"percentile":0.94732,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-rmr5-cpv2-vgjf","url":"https://osv.dev/vulnerability/GHSA-rmr5-cpv2-vgjf","summary":"Denial of Service by injecting highly recursive collections or maps in XStream","modified":"2026-07-08T06:29:15.393142409Z","packages":[{"ecosystem":"Maven","name":"com.thoughtworks.xstream:xstream","purl":"pkg:maven/com.thoughtworks.xstream/xstream","ranges":["<1.4.19"],"fixed":["1.4.19"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}