{"id":"CVE-2021-39150","revision":"e084092a4d0641e9b7f0b48b24bd79bb","records":[{"revision":"e084092a4d0641e9b7f0b48b24bd79bb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2021-39150","aliases":[],"title":"A Server-Side Forgery Request vulnerability in XStream via PriorityQueue unmarshaling","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 request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime version 14 to 8. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the [Security Framework](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.18.","state":0,"publishedAt":"2021-08-23T18:20:15+00:00","modifiedAt":"2026-10-07T19:59:57.115+00:00","affected":[{"ecosystem":"Vendor product","name":"xstream","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"xstream\",\n                    \"vendor\": \"x-stream\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"< 1.4.18\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.5,"severity":"HIGH"}],"references":["https://github.com/x-stream/xstream/security/advisories/GHSA-cxfm-5m4g-x7xp","https://x-stream.github.io/CVE-2021-39150.html","https://lists.debian.org/debian-lts-announce/2021/09/msg00017.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGXIU3YDPG6OGTDHMBLAFN7BPBERXREB/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVPHZA7VW2RRSDCOIPP2W6O5ND254TU7/","https://www.debian.org/security/2021/dsa-5004","https://www.oracle.com/security-alerts/cpujan2022.html","https://security.netapp.com/advisory/ntap-20210923-0003/","https://www.oracle.com/security-alerts/cpuapr2022.html","https://www.oracle.com/security-alerts/cpujul2022.html"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-39150","license":"CVE Program Terms of Use","key":"cve-program:CVE-2021-39150","identifiers":["CVE-2021-39150"]},"retained":false,"historicalAffected":[]}],"coverage":[]}