Answer in brief
CVE-2026-3514 records a High severity (CVSS 7.5) vulnerability in Prefect has an Authentication Middleware Bypass when URL paths are appended with 'health' or 'ready'. The current sources do not mark it as known exploited. The current feed maps prefect (pip), prefect (pypi). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps prefect (pip), prefect (pypi). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| prefectpip | <3.6.22.dev7 | 3.6.22.dev7 |
| prefectpypi | >=0 <3.6.22.dev7 | 3.6.22.dev7 |
Published upstream
Jun 2, 2026
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Jul 10, 2026
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.
Quoted source text, attributed separately from HOL analysis.