CVE-2026-31908: Apache APISIX

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

Header injection vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin to inject malicious headers. This issue affects Apache APISIX: from 2.12.0 through 3.15.0. Users are recommended to upgrade to version 3.16.0, which fixes the issue.

Affected products

• Apache APISIX: from 2.12.0, before 3.16.0 (fixed in 3.16.0)

Published 2026-04-14. Last modified 2026-06-17.