GitHub Advisoryadvisory · PyPI

GHSA-c635-393c-hcx2 Prefect has an Authentication Middleware Bypass when URL paths are appended with 'health' or 'ready'

HIGH Published 2026-06-02 Modified 2026-07-09 Official page ↗
Aliases
CVE-2026-3514
Ecosystem
PyPI
Packages
prefect
Severity
High
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-863
Reviewed
2026-07-09

Affected packages

• PyPI prefect: < 3.6.22.dev7 → fixed in 3.6.22.dev7

Description

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.

Related

Alias · CVE (1)

  • 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… vulnerability

Weakness · CWE (1)

  • CWE-863 Incorrect Authorization weakness

References