{"id":"CVE-2021-31522","aliases":["EUVD-2022-0672","GHSA-q656-g2x3-8cgh"],"status":"published","title":"Apache Kylin unsafe class loading","description":"Kylin can receive user input and load any class through Class.forName(...). This issue affects Apache Kylin 2 version 2.6.6 and prior versions; Apache Kylin 3 version 3.1.2 and prior versions; Apache Kylin 4 version 4.0.0 and prior versions.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.02998,"percentile":0.87547,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-470"],"published":"2022-01-06T12:35:18Z","modified":"2026-10-24T10:31:03Z","fixes":[{"ecosystem":"Maven","package":"org.apache.kylin:kylin","fixed_in":["3.1.3","4.0.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.apache.kylin:kylin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.3"}]}]},{"source":"ghsa","ecosystem":"Maven","package":"org.apache.kylin:kylin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"last_affected":"4.0.0"},{"fixed":"4.0.1"}]}],"versions":["4.0.0"]},{"source":"osv","ecosystem":"Maven","package":"org.apache.kylin:kylin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.3"}]}],"versions":["0.7.1-incubating","0.7.2-incubating","1.0-incubating","1.1-incubating","1.1.1-incubating","1.2","1.3.0","1.5.0","1.5.1","1.5.2","1.5.2.1","1.5.3","1.5.4","1.5.4.1","1.6.0","2.0.0","2.1.0","2.2.0","2.3.0","2.3.1","2.3.2","2.4.0","2.4.1","2.5.0","2.5.1","2.5.2","2.6.0","2.6.1","2.6.2","2.6.3","2.6.4","2.6.5","2.6.6","3.0.0","3.0.0-alpha","3.0.0-alpha2","3.0.1","3.0.2","3.1.0","3.1.1","3.1.2"]},{"source":"osv","ecosystem":"Maven","package":"org.apache.kylin:kylin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.0.1"}]}],"versions":["4.0.0"]}],"products":[{"vendor":"apache","product":"kylin"},{"vendor":"apache software foundation","product":"apache kylin"}],"references":[{"url":"https://lists.apache.org/thread/hh5crx3yr701zd8wtpqo1mww2rlkvznw","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory","fix","web"]},{"url":"http://www.openwall.com/lists/oss-security/2022/01/06/4","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31522","tags":["advisory"]},{"url":"https://github.com/apache/kylin/pull/1695","tags":["web"]},{"url":"https://github.com/apache/kylin/pull/1763","tags":["web"]},{"url":"https://github.com/advisories/GHSA-q656-g2x3-8cgh"},{"url":"https://github.com/apache/kylin","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-31522","title":"Apache Kylin unsafe class loading","description":"Kylin can receive user input and load any class through Class.forName(...). This issue affects Apache Kylin 2 version 2.6.6 and prior versions; Apache Kylin 3 version 3.1.2 and prior versions; Apache Kylin 4 version 4.0.0 and prior versions.","status":"published","published":"2022-01-06T12:35:18Z","modified":"2024-08-03T23:03:33.379Z","updated_at":"2026-11-02T14:33:05.665371Z"}],"euvd":[{"id":"EUVD-2022-0672","description":"Kylin can receive user input and load any class through Class.forName(...). This issue affects Apache Kylin 2 version 2.6.6 and prior versions; Apache Kylin 3 version 3.1.2 and prior versions; Apache Kylin 4 version 4.0.0 and prior versions.","status":"published","published":"2022-01-06T12:35:18Z","modified":"2024-08-03T23:03:33Z","updated_at":"2026-11-03T03:24:38.423371Z"}],"ghsa":[{"id":"GHSA-q656-g2x3-8cgh","title":"Kylin can receive user input and load any class through Class.forName(...).","description":"Kylin can receive user input and load any class through Class.forName(...). This issue affects Apache Kylin 2 version 2.6.6 and prior versions; Apache Kylin 3 version 3.1.2 and prior versions; Apache Kylin 4 version 4.0.0 and prior versions.","status":"published","published":"2022-01-08T00:43:01Z","modified":"2023-02-03T05:04:07Z","cwes":["CWE-470"],"updated_at":"2026-11-02T14:36:41.967989Z"}],"nvd":[{"id":"CVE-2021-31522","description":"Kylin can receive user input and load any class through Class.forName(...). This issue affects Apache Kylin 2 version 2.6.6 and prior versions; Apache Kylin 3 version 3.1.2 and prior versions; Apache Kylin 4 version 4.0.0 and prior versions.","status":"published","published":"2022-01-06T13:15:08.027Z","modified":"2026-06-17T03:51:57.34Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-470"],"updated_at":"2026-11-02T14:07:03.418194Z"}],"osv":[{"id":"CVE-2021-31522","description":"Kylin can receive user input and load any class through Class.forName(...). This issue affects Apache Kylin 2 version 2.6.6 and prior versions; Apache Kylin 3 version 3.1.2 and prior versions; Apache Kylin 4 version 4.0.0 and prior versions.","status":"published","published":"2022-01-06T13:15:08.027Z","modified":"2026-10-24T10:31:03.167574109Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:19.483607Z"},{"id":"GHSA-q656-g2x3-8cgh","title":"Kylin can receive user input and load any class through Class.forName(...).","description":"Kylin can receive user input and load any class through Class.forName(...). This issue affects Apache Kylin 2 version 2.6.6 and prior versions; Apache Kylin 3 version 3.1.2 and prior versions; Apache Kylin 4 version 4.0.0 and prior versions.","status":"published","published":"2022-01-08T00:43:01Z","modified":"2024-12-04T05:48:28.226118Z","cwes":["CWE-470"],"updated_at":"2026-11-02T15:46:54.055966Z"}]}}