CRITICAL: CVE-2026-39999 (CVSS 9.1) — apache apisix

CVE: CVE-2026-39999

CVSS: 9.1 (3.1) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Severity: CRITICAL

Status: Critical advisory

Affected

• apache apisix

Summary

Authentication Bypass by Spoofing vulnerability in Apache APISIX.

The attacker can completely bypass authentication capitalising on certain configurations of jwt-auth plugin.

This issue affects Apache APISIX: from v2.2 through v3.16.0.

Users are recommended to upgrade to version v3.17.0, which fixes the issue.

Verified Sources

• NVD entry
• GitHub Advisory
• MITRE

References

• https://lists.apache.org/thread/nfopt8cnxd3k0rs1oxtr7lzxrdw4mojq
• http://www.openwall.com/lists/oss-security/2026/06/19/5

_Validated by the Lyrie Threat Intelligence Pipeline — 3 independent sources confirmed before publication. No speculation._