{"id":"CVE-2025-43866","aliases":["GHSA-m3mq-f375-5vgh","PYSEC-2025-221"],"url":"https://o3.security/vulnerability/CVE-2025-43866","summary":"Vantage6 Server JWT secret not cryptographically secure","details":"### 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","published":"2025-06-12T18:04:57.649Z","modified":"2026-08-12T03:51:26.158246566Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"vantage6-server","fixedVersion":"4.11.0"}],"fix":{"url":"https://github.com/vantage6/vantage6/commit/e39a262faf1cd4c554bf1b8e57eeea082da995c0","label":"vantage6/vantage6@e39a262"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/43xxx/CVE-2025-43866.json"},{"type":"ADVISORY","url":"https://github.com/vantage6/vantage6/security/advisories/GHSA-m3mq-f375-5vgh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-43866"},{"type":"WEB","url":"https://github.com/vantage6/vantage6/commit/e39a262faf1cd4c554bf1b8e57eeea082da995c0"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/vantage6-server/PYSEC-2025-221.yaml"},{"type":"PACKAGE","url":"https://github.com/vantage6/vantage6"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:26.158246566Z"}}