CVE-2026-39999 Apache APISIX: JWT Algorithm Confusion allows authentication bypass
Attackers can bypass authentication in Apache APISIX by exploiting JWT algorithm confusion in specific jwt-auth plugin configurations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-39999?
CVE-2026-39999 is a high-severity authentication bypass vulnerability in Apache APISIX, published on 19 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Authentication Bypass by Spoofing vulnerability in Apache APISIX.
The attacker can completely bypass authentication capitalising on certain configurations of jwt-auth plugin. This issue affects Apache APISIX: from v2.2 through v3.16.0.
Users are recommended to upgrade to version v3.17.0, which fixes the issue.
Weakness: CWE-290
Which versions are affected by CVE-2026-39999?
1 open source package ship an affected version, including apisix. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
apisix Bitnami | From 2.2.0 | 3.17.0 |
Products include Apache Apisix.
How do I fix CVE-2026-39999?
Upgrade apisix to 3.17.0 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-39999 being exploited?
There is no known exploitation of CVE-2026-39999 in the wild and no public exploit code.
Other vulnerabilities in Apache APISIX
- CVE-2022-24112 Apache APISIX Authentication Bypass
- CVE-2022-25757 Apache APISIX: the body_schema check in request-validation plugin can be bypassed
- CVE-2026-31908 Apache APISIX: forward auth plugin allows header injection
- CVE-2026-75005 Apache APISIX: Unauthenticated CPU-exhaustion DoS
- CVE-2025-27446 Privilege escalation in Apache APISIX Java Plugin Runner
Sources
Also known as BIT-apisix-2026-39999, GHSA-pw26-hvcp-w6vj, MINI-cwfj-rp8r-x65q.