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CVE-2026-31908

CRITICAL CVSS 3.1: 9.1
Updated Apr 17, 2026
Apache
Parameter Value
CVSS 9.1 (CRITICAL)
Affected Versions 2.12.0 — 3.16.0
Fixed In 3.16.0
Type CWE-75
Vendor Apache
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Apache Apisix
cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:*
2.12.0 3.16.0