CVE-2026-39998

Improper Input Validation vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin to spoof identity headers. This issue affects Apache APISIX: from 2.12.0 through 3.16.0. Users are recommended to upgrade to version 3.17.0, which fixes the issue.

Score

CVSS 3.1 8.8 High

Status

Analyzed - security@apache.org

Published

2026-06-19

Last modified

2026-10-26

Weaknesses

CWE-20

Affected products

• Apisix (Apache)
• Apache Apisix (Apache Software Foundation)

References

• https://lists.apache.org/thread/vgkvy396010d7g6m0jrn4d3hjf2svlvv
• http://www.openwall.com/lists/oss-security/2026/06/19/4