CVE-2026-31908

CRITICAL 9.1

Apache APISIX: forward auth plugin allows header injection

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

8th

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.

CWE	CWE-75
Vendor	apache software foundation
Product	apache apisix
Published	Apr 14, 2026
Last Updated	Apr 16, 2026

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Affected Versions

Apache Software Foundation / Apache APISIX

2.12.0 ≤ 3.15.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

lists.apache.org: https://lists.apache.org/thread/sob643s5lztov7x579j8o0c444t36n6b openwall.com: http://www.openwall.com/lists/oss-security/2026/04/14/3

Credits

🔍 SeungMyung Lee