{"id":"CVE-2016-4000","aliases":["GHSA-6r7r-jj8h-pq6v"],"url":"https://o3.security/vulnerability/CVE-2016-4000","summary":"Deserialization of Untrusted Data in Jython","details":"Jython before 2.7.1rc1 allows attackers to execute arbitrary code via a crafted serialized PyFunction object.","published":"2017-07-06T16:29:00.203Z","modified":"2026-03-15T21:50:34.075925Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.06404,"percentile":0.93079,"asOf":"2026-08-18"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.python:jython-standalone","fixedVersion":"2.7.1b3"},{"ecosystem":"Maven","name":"org.python:jython","fixedVersion":"2.7.1b3"}],"fix":null,"references":[{"type":"WEB","url":"https://lists.apache.org/thread.html/0919ec1db20b1022f22b8e78f355667df74d6142b463ff17d03ad533%40%3Cdevnull.infra.apache.org%3E"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuapr2020.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujan2020.html"},{"type":"WEB","url":"http://www.securityfocus.com/bid/105647"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujul2020.html"},{"type":"ADVISORY","url":"http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html"},{"type":"ADVISORY","url":"https://hg.python.org/jython/file/v2.7.1rc1/NEWS"},{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2016-4000"},{"type":"ADVISORY","url":"https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html"},{"type":"ADVISORY","url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=864859"},{"type":"ADVISORY","url":"https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html"},{"type":"ADVISORY","url":"http://bugs.jython.org/issue2454"},{"type":"ADVISORY","url":"http://www.debian.org/security/2017/dsa-3893"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/201710-28"},{"type":"ADVISORY","url":"https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html"},{"type":"ADVISORY","url":"https://snyk.io/vuln/SNYK-JAVA-ORGPYTHON-31451"},{"type":"FIX","url":"https://hg.python.org/jython/rev/d06e29d100c0"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-03-15T21:50:34.075925Z"}}