CVE-2026-31908

Critical

Description

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.

SeverityCritical

CVSS9.1

Exploit probability—

Product

Apache Apisix

PublishedApr 14, 2026

First seenApr 14, 2026

Weakness typeCWE-75CWE-75

How to fix

Update

apache apisix3.16.0 or later

Vendor advisories

lists.apache.org/thread/sob643s5lztov7x579j8o0c444t36n6b

Affected products

Product	Affected versions	Fixed in
apache apisix	2.12.0 ≤ v < 3.16.0	3.16.0

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