https://seclists.org/oss-sec/2026/q2/973: CVE-2026-39999: Apache APISIX: JWT Algorithm Confusion allows authentication bypass
Published Jun 19, 2026
·Updated
Affected Software
1 affected component
Apache APISIX>=2.2<=3.16.0
Frequently Asked Questions
1
What is the severity of CVE-2026-39999?
CVE-2026-39999 has a severity rating that indicates it allows authentication bypass in vulnerable versions of Apache APISIX.
2
How do I fix CVE-2026-39999?
To fix CVE-2026-39999, upgrade Apache APISIX to a version above 3.16.0 or apply necessary configuration changes as outlined in security patches.
3
Which versions of Apache APISIX are affected by CVE-2026-39999?
Apache APISIX versions 2.2 through 3.16.0 are affected by CVE-2026-39999.
4
What type of vulnerability is CVE-2026-39999?
CVE-2026-39999 is classified as an authentication bypass vulnerability due to algorithm confusion in the jwt-auth plugin.
5
Who is impacted by CVE-2026-39999?
Users running affected versions of Apache APISIX who utilize the jwt-auth plugin for authentication are impacted by CVE-2026-39999.