{"id":"CVE-2018-3779","aliases":["EUVD-2018-0352","GHSA-2j55-pcw5-x4h2"],"status":"published","title":"active-support impersonates 'activesupport' gem","description":"active-support ruby gem 5.2.0 could allow a remote attacker to execute arbitrary code on the system, caused by containing a malicious backdoor. An attacker could exploit this vulnerability to execute arbitrary code on the system.","severity":{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.06477,"percentile":0.93792,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-77"],"published":"2018-08-10T21:00:00Z","modified":"2026-06-17T01:57:48Z","affected":[{"source":"ghsa","ecosystem":"RubyGems","package":"active-support","ranges":[{"type":"UNPARSED","raw":"\u003e 0","events":[]}]},{"source":"osv","ecosystem":"RubyGems","package":"active-support","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]}],"products":[{"vendor":"activesupport_project","product":"activesupport"},{"vendor":"hackerone","product":"active-support ruby gem"}],"references":[{"url":"https://hackerone.com/reports/392311","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-3779","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-2j55-pcw5-x4h2","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2018-3779","description":"active-support ruby gem 5.2.0 could allow a remote attacker to execute arbitrary code on the system, caused by containing a malicious backdoor. An attacker could exploit this vulnerability to execute arbitrary code on the system.","status":"published","published":"2018-08-10T21:00:00Z","modified":"2024-08-05T04:50:30.831Z","cwes":["CWE-77"],"updated_at":"2026-11-02T14:35:05.619113Z"}],"euvd":[{"id":"EUVD-2018-0352","description":"active-support ruby gem 5.2.0 could allow a remote attacker to execute arbitrary code on the system, caused by containing a malicious backdoor. An attacker could exploit this vulnerability to execute arbitrary code on the system.","status":"published","published":"2018-08-10T21:00:00Z","modified":"2024-08-05T04:50:30Z","updated_at":"2026-11-03T02:40:15.759349Z"}],"ghsa":[{"id":"GHSA-2j55-pcw5-x4h2","title":"active-support impersonates 'activesupport' gem","description":"The `active-support` ruby gem gem is malware and duplicates the official `activesupport` (no hyphen) gem, but adds a compiled extension. The extension attempts to resolve a base64 encoded domain (29faea63.planfhntage.de), downloads a payload, and executes.\n \nThis trojan horse gem could allow a remote attacker to execute arbitrary code on the system, caused by containing a malicious backdoor. An attacker could exploit this vulnerability to execute arbitrary code on the system.  No version of this gem should be considered safe.","status":"published","published":"2018-08-13T15:02:49Z","modified":"2023-01-18T21:33:05Z","cwes":["CWE-77"],"updated_at":"2026-11-02T14:36:14.033357Z"}],"nvd":[{"id":"CVE-2018-3779","description":"active-support ruby gem 5.2.0 could allow a remote attacker to execute arbitrary code on the system, caused by containing a malicious backdoor. An attacker could exploit this vulnerability to execute arbitrary code on the system.","status":"published","published":"2018-08-10T21:29:00.22Z","modified":"2026-06-17T01:57:48.85Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-77"],"updated_at":"2026-11-02T14:04:35.310988Z"}],"osv":[{"id":"GHSA-2j55-pcw5-x4h2","title":"active-support impersonates 'activesupport' gem","description":"The `active-support` ruby gem gem is malware and duplicates the official `activesupport` (no hyphen) gem, but adds a compiled extension. The extension attempts to resolve a base64 encoded domain (29faea63.planfhntage.de), downloads a payload, and executes.\n \nThis trojan horse gem could allow a remote attacker to execute arbitrary code on the system, caused by containing a malicious backdoor. An attacker could exploit this vulnerability to execute arbitrary code on the system.  No version of this gem should be considered safe.","status":"published","published":"2018-08-13T15:02:49Z","modified":"2023-11-08T04:00:19.936014Z","cwes":["CWE-77"],"updated_at":"2026-11-02T15:46:34.338541Z"}]}}