CVE-2026-31908 — CRITICAL (9.1)

Q: How severe is CVE-2026-31908?

CVE-2026-31908 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2026-31908?

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

Vulnerability 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.

CVSS Score

9.1

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Apache	Apisix	>= 2.12.0, < 3.16.0

Related Weaknesses (CWE)

CWE-75

References

https://lists.apache.org/thread/sob643s5lztov7x579j8o0c444t36n6bMailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/14/3Mailing ListThird Party Advisory

FAQ

What is CVE-2026-31908?

CVE-2026-31908 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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....

How severe is CVE-2026-31908?

CVE-2026-31908 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-31908?

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