CVE-2026-3514: 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…

PriorityP353high7.5CVSS 3.0

AVNACLPRNUINSUCHINAN

EPSS

0.48%

37.5th percentile

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
prefect	prefect	< 3.6.22	3.6.22
prefecthq	prefecthq_prefect	>= unspecified < 3.6.22	3.6.22

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.