CVE-2026-3514 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-3514HIGH

prefecthq prefecthq/prefect — Authentication Bypass in prefecthq/prefect

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  N  N    7.5   .0048   39.3     —

AFFECTED
  Product            Versions       Fixed
  prefecthq/prefect  unspecified –  —

TIMELINE
  Mar 4   Reserved by @huntr_ai
  Jun 2   EXPLOIT PUBLISHED — CVE-2026-3514 (prefecthq/prefect). Public exploit reference added.
  Jun 2   Published (CNA: @huntr_ai)

CWE-863 · CNA: @huntr_ai · CVSS v3.0 · 2 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
March 4, 2026	Reserved	Reserved by @huntr_ai
June 2, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3514 (prefecthq/prefect). Public exploit reference added.
June 2, 2026	Published	Published (CNA: @huntr_ai)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
prefecthq	prefecthq/prefect	—	unspecified	—

Weaknesses

CWE-863

References (2)

https://github.com/prefecthq/prefect/commit/e21617125335025b4b27e7d6f0ca028e8e8f3b79 [Patch]
https://huntr.com/bounties/c540e5e1-f74f-44f4-bfa0-9764ff6daa75 [Exploit, Third Party Advisory]

Authoritative record: CVE-2026-3514 at cve.org

Vendors: prefecthq

Weaknesses: CWE-863

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-3514 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.