CVE-2026-31908

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.

Score

CVSS 3.1 9.1 Critical

Status

Analyzed - security@apache.org

Published

2026-04-14

Last modified

2026-10-26

Weaknesses

CWE-75

Affected products

• Apisix (Apache)
• Apache Apisix (Apache Software Foundation)

References

• https://lists.apache.org/thread/sob643s5lztov7x579j8o0c444t36n6b
• http://www.openwall.com/lists/oss-security/2026/04/14/3