CVE-2026-3514
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk38th percentile - higher than 38% of all known CVEs
Summary
In version 3.6.19 of prefecthq/prefect, an authentication bypass vulnerability exists because the authentication middleware exempts URL paths ending with 'health' or 'ready'. An attacker can create resources with such names and access them without authentication.
Risk Assessment
An attacker could gain unauthorized access to sensitive information, such as API keys and database credentials, stored in Prefect Variables.
Recommendation
Upgrade prefecthq/prefect to a version that includes a fix. As a temporary measure, restrict API access via firewall rules.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

