🛡️ CVE-2026-39998 — apisix

🟡 CVSS 5.0 — Medium ✅ No Known Exploit CWE-20 OSV
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Apache APISIX: Identity Injection via forward-auth Plugin Missing Header Cleanup

Improper Input Validation vulnerability in Apache APISIX.

The attacker can take advantage of certain configuration in forward-auth plugin to spoof identity headers.

This issue affects Apache APISIX: from 2.12.0 through 3.16.0.

Users are recommended to upgrade to version 3.17.0, which fixes the issue.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-39998 is classified as CWE-20: Improper Input Validation. The application accepts input without checking that it has the expected form, so malformed values reach code that assumes they are well formed.

Affected software

CVE-2026-39998 is recorded against 1 package.

  • apisix

Timeline and source

Published on 23 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

www.openwall.com (Web)
lists.apache.org (Web)
nvd.nist.gov (Web)

Details

Severity MEDIUM
CVSS Score 5.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE CWE-20
Public Exploit ✅ No
Source OSV
Published 2026-06-23
Updated 2026-08-12
Modified 2026-06-23
Fix URL N/A

Affected Packages

Software From version Fixed in
apisix — —

Similar Threats

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