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CVE-2026-31908

CriticalPublished

Apache APISIX: forward auth plugin allows header injection

Published: Apr 14, 2026
Updated: Apr 16, 2026
Assigning CNA: apache
Evidence observed: Aug 25, 2026

Primary CVSS

9.1/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 43.0%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-31908PoC
Proof-of-concept exploit for CVE-2026-31908, a critical header injection vulnerability in Apache APISIX, demonstrating authentication bypass and privilege escalation through CRLF injection in the forward-auth plugin.

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