CVE-2026-39999: Apache APISIX

Critical severity, CVSS 9.1. EPSS: 0.6% chance of exploitation in the next 30 days.

Authentication Bypass by Spoofing vulnerability in Apache APISIX. The attacker can completely bypass authentication capitalising on certain configurations of jwt-auth plugin. This issue affects Apache APISIX: from v2.2 through v3.16.0. Users are recommended to upgrade to version v3.17.0, which fixes the issue.

Affected products

• Apache APISIX: from 2.2, before 3.17.0 (fixed in 3.17.0)

Published 2026-06-19. Last modified 2026-06-23.