CVE-2026-3514High· 7.5▾ TwilightPrefect has an Authentication Middleware Bypass when URL paths are appended with 'health' or 'ready'
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 10.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.5%
Last analysed / modified upstream
In version 3.6.19 of prefecthq/prefect, an authentication bypass vulnerability exists due to the improper handling of URL path exemptions for health check probes. Specifically, the authentication middleware exempts any URL path ending with 'health' or 'ready' from authentication checks. This allows an attacker to create resources with names ending in 'health' or 'ready' and access them without authentication. Affected endpoints include those for variables, flows, work pools, work queues, and deployments. This vulnerability can lead to unauthorized access to sensitive information, such as API keys and database credentials, stored in Prefect Variables.
prefect < 3.6.22.dev7Upgrade to a patched release:
prefect 3.6.22.dev7Connected by shared product, vendor, weakness, or advisory.
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