{"id":"CVE-2026-126937","summary":"Zipline before 4.6.5 TOCTOU Race Condition via /api/setup","details":"Zipline before 4.6.5 contains a TOCTOU race condition in the POST /api/setup endpoint that allows unauthenticated attackers to create multiple SUPERADMIN accounts by racing concurrent requests before the firstSetup flag is reset. Attackers can send simultaneous requests with spoofed X-Forwarded-For headers during the argon2 hashing window to gain full administrative control of the instance.","aliases":["GHSA-wgjv-p9mm-qw77"],"modified":"2026-11-14T02:47:30.865603994Z","published":"2026-11-13T09:34:40.499Z","database_specific":{"cwe_ids":["CWE-367"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126937.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126937.json"},{"type":"ADVISORY","url":"https://github.com/diced/zipline/security/advisories/GHSA-wgjv-p9mm-qw77"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126937"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/zipline-before-4.6.5-toctou-race-condition-via-api-setup"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/diced/zipline","events":[{"introduced":"0"},{"fixed":"ca7506268c415f1c6f948f635c127b3a2019700d"}],"database_specific":{"extracted_events":[{"strategy":"StandardRange","range":[{"introduced":"0"},{"fixed":"4.6.5"}],"source":"AFFECTED_FIELD"}]}}],"versions":["v4.6.4","v4.6.3","v4.6.2","v4.6.1","v4.6.0","v4.5.3","v4.5.2","v4.5.1","v4.5.0","v4.4.2","v4.4.1","v4.4.0","v4.3.2","v4.3.1","v4.3.0","v4.2.3","v4.2.2","v4.2.1","v4.2.0","v4.1.2","v4.1.1","v4.1.0","v4.0.2","v4.0.1","v4.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126937.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}