CVE-2026-39998 — HIGH (8.8)

Q: How severe is CVE-2026-39998?

CVE-2026-39998 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-39998?

Check the references section above for vendor advisories and patch information. Affected products include: Apache Apisix.

Vulnerability 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.

CVSS Score

8.8

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Apache	Apisix	>= 2.12.0, < 3.17.0

Related Weaknesses (CWE)

CWE-20

References

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

FAQ

What is CVE-2026-39998?

CVE-2026-39998 is a vulnerability with a CVSS score of 8.8 (HIGH). 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: ...

How severe is CVE-2026-39998?

CVE-2026-39998 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-39998?

Check the references section above for vendor advisories and patch information. Affected products include: Apache Apisix.