Header Injection Vulnerability in Apache APISIX by Apache Software Foundation
CVE-2026-31908

9.1CRITICAL

Key Information:

Vendor

Apache
Status
Apache Apisix
Vendor
CVE Published:
14 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-31908?

A header injection vulnerability exists in Apache APISIX that can be exploited by attackers through improper configuration in the forward-auth plugin. This flaw allows for the injection of malicious headers, posing a risk to the integrity and security of the application. Users are advised to upgrade to version 3.16.0 to mitigate this risk and enhance their system's security.

Affected Version(s)

Apache APISIX 2.12.0 <= 3.15.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-31908
Created by MehranTurk

References

https://lists.apache.org/thread/sob643s5lztov7x579j8o0c44...
vendor-advisory

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

SeungMyung Lee
.