CVE-2026-31908
Apache APISIX: forward auth plugin allows header injection
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Apache APISIX: forward auth plugin allows header injection
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.
- Record
CVE-2026-31908- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-75
- Updated
- 2026-11-02
EUVDEUVD-2026-22225
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.
- Record
EUVD-2026-22225- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-jv22-34xc-w9x6
Header injection vulnerability in Apache APISIX. The attacker can take advantage of certain...
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.
- Record
GHSA-jv22-34xc-w9x6- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-75
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-31908- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-75
- Updated
- 2026-11-02
OSV
Apache APISIX: forward auth plugin allows header injection
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.
- Record
CVE-2026-31908- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-75
- Updated
- 2026-11-02
OSVBIT-apisix-2026-31908 No score
Apache APISIX: forward auth plugin allows header injection
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.
- Record
BIT-apisix-2026-31908- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
apisixBitnami |
2.12.0 up to 3.16.0 | 3.16.0 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | MehranTurk/CVE-2026-31908 | 2026-04-19 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-31908 is a critical vulnerability (CVSS 9.1) in Apache Apisix, published April 14, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.52%, the 44th percentile. Fixed in apisix 3.16.0.