{"id":"CVE-2025-43866","aliases":["EUVD-2025-18201","GHSA-m3mq-f375-5vgh","PYSEC-2025-221"],"status":"published","title":"Vantage6 Server JWT secret not cryptographically secure","description":"vantage6 is an open-source infrastructure for privacy preserving analysis. The JWT secret key in the vantage6 server is auto-generated unless defined by the user. The auto-generated key is a UUID1, which is not cryptographically secure as it is predictable to some extent. This vulnerability is fixed in 4.11.0.","severity":{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00404,"percentile":0.3495,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-330"],"published":"2025-06-12T18:04:57Z","modified":"2026-10-28T02:30:44Z","fixes":[{"ecosystem":"PyPI","package":"vantage6-server","fixed_in":["4.11.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"vantage6-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.11.0"}]}]},{"source":"osv","ecosystem":"PyPI","package":"vantage6-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.11.0"}]}],"versions":["0.0.0","0.0.0b0","0.0.0b1","0.0.0b3","1.0.0","1.0.0b11","1.0.0b12","1.0.0b13","1.0.0b14","1.0.0b2","1.0.0b3","1.0.0b4","1.0.0b5","1.0.0b6","1.0.0b7","1.0.0b8","1.0.0b9","1.0.1","1.2.0","1.2.1","1.2.2","1.2.3","1.2.3.post1","2.0.0","2.0.0.post1","2.0.0a1","2.0.0a2","2.0.0a3","2.0.1rc1","2.0.1rc2","2.1.0","2.1.0rc1","2.1.1","2.1.2","2.1.3b1","2.1.3b2","2.1.3b3","2.1.3b4","2.2.0","2.2.0b1","2.2.0b2","2.2.0b3","2.2.0b4","2.2.1","2.2.10","2.2.11","2.2.12","2.2.2","2.2.3","2.2.4","2.2.5","2.2.6","2.2.7","2.2.8","2.2.9","2.3.0","2.3.0rc1","2.3.0rc2","2.3.0rc3","2.3.0rc4","2.3.0rc5","2.3.1","2.3.2","2.3.2rc1","2.3.3","2.3.4","2.3.5","2.3.5b1","3.0.0","3.0.0b1","3.0.0b3","3.0.0b4","3.0.0b5","3.0.0b6","3.0.0b7","3.0.0b8","3.0.0rc1","3.0.1","3.0.2","3.0.3","3.0.4","3.1.0","3.1.0rc1","3.1.0rc5","3.1.0rc6","3.1.0rc7","3.1.0rc8","3.1.0rc9","3.1.1rc1","3.1.1rc2","3.10.0","3.10.0rc1","3.10.1","3.10.3","3.10.4","3.11.0","3.11.0rc1","3.11.0rc2","3.11.0rc3","3.11.1","3.2.0","3.2.0rc1","3.2.0rc2","3.2.0rc3","3.2.0rc4","3.2.0rc5","3.3.0","3.3.0a0","3.3.0rc1","3.3.0rc2","3.3.0rc3","3.3.0rc4","3.3.1","3.3.2","3.3.3","3.3.4","3.3.5","3.3.6","3.3.7","3.3.7a2","3.3.7a3","3.3.8a1","3.3.8a2","3.3.8a4","3.3.8a5","3.3.8a6","3.3.8a7","3.3.8a8","3.4.0","3.4.0a1","3.4.0a2","3.4.0a3","3.4.0a6","3.4.1","3.4.1a0","3.4.1a1","3.4.1a2","3.4.1a3","3.4.2","3.4.2a0","3.4.3","3.5.0","3.5.0rc1","3.5.0rc2","3.5.0rc3","3.5.1","3.5.2","3.6.0","3.6.1","3.6.1rc1","3.6.1rc2","3.6.1rc3","3.7.0","3.7.0rc1","3.7.0rc2","3.7.1","3.7.2","3.7.3","3.8.0","3.8.0rc3","3.8.1","3.8.2","3.8.2rc1","3.8.3","3.8.4","3.8.5","3.8.6","3.8.7","3.8.7rc1","3.8.8","3.8.8rc1","3.8.8rc2","3.8.8rc3","3.9.0","3.9.0rc2","3.9.0rc4","4.0.0","4.0.0a10","4.0.0a2","4.0.0a3","4.0.0a4","4.0.0a5","4.0.0a6","4.0.0a7","4.0.0a8","4.0.0a9","4.0.1","4.0.1rc2","4.0.2","4.0.3","4.1.0","4.1.0b0","4.1.0b1","4.1.0rc0","4.1.1","4.1.2","4.1.3","4.10.0","4.10.0rc1","4.10.0rc2","4.10.0rc3","4.10.0rc4","4.10.1","4.10.1rc1","4.10.2","4.11.0rc2","4.11.0rc3","4.11.0rc4","4.2.0","4.2.0rc1","4.2.0rc2","4.2.1","4.2.2","4.2.3","4.3.0","4.3.0b3","4.3.0b4","4.3.0b5","4.3.0b6","4.3.0rc1","4.3.0rc2","4.3.1","4.3.2","4.3.2rc2","4.3.4","4.3.4rc3","4.4.0","4.4.0rc3","4.4.1","4.5.0","4.5.0rc3","4.5.1","4.5.2","4.5.3","4.5.4","4.5.5","4.6.0","4.6.0rc3","4.6.0rc4","4.6.0rc5","4.6.0rc6","4.6.0rc7","4.6.1","4.7.0","4.7.0rc1","4.7.0rc2","4.7.1","4.7.1rc1","4.8.0","4.8.0rc1","4.8.0rc2","4.8.0rc3","4.8.1","4.8.2","4.9.0","4.9.0rc1","4.9.1"]},{"source":"osv","ecosystem":"PyPI","package":"vantage6-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.11.0"}]}],"versions":["0.0.0","0.0.0b0","0.0.0b1","0.0.0b3","1.0.0","1.0.0b11","1.0.0b12","1.0.0b13","1.0.0b14","1.0.0b2","1.0.0b3","1.0.0b4","1.0.0b5","1.0.0b6","1.0.0b7","1.0.0b8","1.0.0b9","1.0.1","1.2.0","1.2.1","1.2.2","1.2.3","1.2.3.post1","2.0.0","2.0.0.post1","2.0.0a1","2.0.0a2","2.0.0a3","2.0.1rc1","2.0.1rc2","2.1.0","2.1.0rc1","2.1.1","2.1.2","2.1.3b1","2.1.3b2","2.1.3b3","2.1.3b4","2.2.0","2.2.0b1","2.2.0b2","2.2.0b3","2.2.0b4","2.2.1","2.2.10","2.2.11","2.2.12","2.2.2","2.2.3","2.2.4","2.2.5","2.2.6","2.2.7","2.2.8","2.2.9","2.3.0","2.3.0rc1","2.3.0rc2","2.3.0rc3","2.3.0rc4","2.3.0rc5","2.3.1","2.3.2","2.3.2rc1","2.3.3","2.3.4","2.3.5","2.3.5b1","3.0.0","3.0.0b1","3.0.0b3","3.0.0b4","3.0.0b5","3.0.0b6","3.0.0b7","3.0.0b8","3.0.0rc1","3.0.1","3.0.2","3.0.3","3.0.4","3.1.0","3.1.0rc1","3.1.0rc5","3.1.0rc6","3.1.0rc7","3.1.0rc8","3.1.0rc9","3.1.1rc1","3.1.1rc2","3.10.0","3.10.0rc1","3.10.1","3.10.3","3.10.4","3.11.0","3.11.0rc1","3.11.0rc2","3.11.0rc3","3.11.1","3.2.0","3.2.0rc1","3.2.0rc2","3.2.0rc3","3.2.0rc4","3.2.0rc5","3.3.0","3.3.0a0","3.3.0rc1","3.3.0rc2","3.3.0rc3","3.3.0rc4","3.3.1","3.3.2","3.3.3","3.3.4","3.3.5","3.3.6","3.3.7","3.3.7a2","3.3.7a3","3.3.8a1","3.3.8a2","3.3.8a4","3.3.8a5","3.3.8a6","3.3.8a7","3.3.8a8","3.4.0","3.4.0a1","3.4.0a2","3.4.0a3","3.4.0a6","3.4.1","3.4.1a0","3.4.1a1","3.4.1a2","3.4.1a3","3.4.2","3.4.2a0","3.4.3","3.5.0","3.5.0rc1","3.5.0rc2","3.5.0rc3","3.5.1","3.5.2","3.6.0","3.6.1","3.6.1rc1","3.6.1rc2","3.6.1rc3","3.7.0","3.7.0rc1","3.7.0rc2","3.7.1","3.7.2","3.7.3","3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Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-43866","tags":["advisory"]},{"url":"https://github.com/vantage6/vantage6/commit/e39a262faf1cd4c554bf1b8e57eeea082da995c0","tags":["web"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/vantage6-server/PYSEC-2025-221.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-m3mq-f375-5vgh"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/43xxx/CVE-2025-43866.json","tags":["advisory"]},{"url":"https://github.com/vantage6/vantage6","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-43866","title":"Vantage6 Server JWT secret not cryptographically secure","description":"vantage6 is an open-source infrastructure for privacy preserving analysis. The JWT secret key in the vantage6 server is auto-generated unless defined by the user. The auto-generated key is a UUID1, which is not cryptographically secure as it is predictable to some extent. This vulnerability is fixed in 4.11.0.","status":"published","published":"2025-06-12T18:04:57.649Z","modified":"2025-06-13T14:06:06.347Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U","level":"low","assessor":"cna"}],"cwes":["CWE-330"],"updated_at":"2026-11-02T14:32:26.964524Z"}],"euvd":[{"id":"EUVD-2025-18201","description":"vantage6 is an open-source infrastructure for privacy preserving analysis. The JWT secret key in the vantage6 server is auto-generated unless defined by the user. The auto-generated key is a UUID1, which is not cryptographically secure as it is predictable to some extent. This vulnerability is fixed in 4.11.0.","status":"published","published":"2025-06-12T18:04:57Z","modified":"2025-06-13T14:06:06Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U","level":"low"}],"updated_at":"2026-11-02T20:32:24.065864Z"}],"ghsa":[{"id":"GHSA-m3mq-f375-5vgh","title":"Vantage6 Server JWT secret not cryptographically secure","description":"### Impact\nThe JWT secret key in the vantage6 server is auto-generated unless defined by the user. The auto-generated key is a UUID1, which is not cryptographically secure as it is [predictable to some extent](https://docs.python.org/3/library/uuid.html#uuid.uuid1)\n\n### Patches\nNo\n\n### Workarounds\nYou may define JWT secret key in the server configuration file","status":"published","published":"2025-06-12T23:02:13Z","modified":"2026-06-08T19:52:09Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U","level":"low"}],"cwes":["CWE-330"],"updated_at":"2026-11-02T14:40:18.682012Z"}],"nvd":[{"id":"CVE-2025-43866","description":"vantage6 is an open-source infrastructure for privacy preserving analysis. The JWT secret key in the vantage6 server is auto-generated unless defined by the user. The auto-generated key is a UUID1, which is not cryptographically secure as it is predictable to some extent. This vulnerability is fixed in 4.11.0.","status":"published","published":"2025-06-12T18:15:20.713Z","modified":"2026-06-17T09:24:40.323Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-330"],"updated_at":"2026-11-02T14:11:11.789448Z"}],"osv":[{"id":"CVE-2025-43866","title":"Vantage6 Server JWT secret not cryptographically secure","description":"vantage6 is an open-source infrastructure for privacy preserving analysis. The JWT secret key in the vantage6 server is auto-generated unless defined by the user. The auto-generated key is a UUID1, which is not cryptographically secure as it is predictable to some extent. This vulnerability is fixed in 4.11.0.","status":"published","published":"2025-06-12T18:04:57.649Z","modified":"2026-10-28T02:30:44.986611352Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U","level":"low"}],"cwes":["CWE-330"],"updated_at":"2026-11-02T15:44:49.707645Z"},{"id":"GHSA-m3mq-f375-5vgh","title":"Vantage6 Server JWT secret not cryptographically secure","description":"### Impact\nThe JWT secret key in the vantage6 server is auto-generated unless defined by the user. The auto-generated key is a UUID1, which is not cryptographically secure as it is [predictable to some extent](https://docs.python.org/3/library/uuid.html#uuid.uuid1)\n\n### Patches\nNo\n\n### Workarounds\nYou may define JWT secret key in the server configuration file","status":"published","published":"2025-06-12T23:02:13Z","modified":"2026-06-08T20:00:14.50131655Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U","level":"low"}],"cwes":["CWE-330"],"updated_at":"2026-11-02T15:46:51.10002Z"},{"id":"PYSEC-2025-221","description":"vantage6 is an open-source infrastructure for privacy preserving analysis. The JWT secret key in the vantage6 server is auto-generated unless defined by the user. The auto-generated key is a UUID1, which is not cryptographically secure as it is predictable to some extent. This vulnerability is fixed in 4.11.0.","status":"published","published":"2025-06-12T18:15:20.713Z","modified":"2026-05-20T09:19:21.163912Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:54.242332Z"}]}}