CVE-2026-39998

HighCVSS 8.8/10Last modified Oct 26, 2026

Description

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.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-20

Affected software

Vendor	Product	Versions
Apache Software Foundation	Apache APISIX	>= 2.12.0, <= 3.16.0

References

https://lists.apache.org/thread/vgkvy396010d7g6m0jrn4d3hjf2svlvvVendor Advisory, Mailing List
http://www.openwall.com/lists/oss-security/2026/06/19/4Third Party Advisory

Timeline

Published: Jun 19, 2026
Last modified: Oct 26, 2026
NVD status: Analyzed

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