CVE-2026-6338

HTTP request smuggling in Kong Enteprise Gateway

CVSS 4.9 MEDIUMEPSS 0.3%CWE-444

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 4.9EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

11 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

A HTTP request smuggling and desynchronization vulnerability affects Kong Gateway Enterprise 3.4, 3.10, 3.11, 3.12, 3.13, and 3.14 series. The vulnerability is caused by a parsing flaw in Kong’s HTTP request processing pipeline when handling untrusted HTTP/1.1 traffic.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:P/R:A/RE:M

Affected products

Kong · Kong Enterprise Gateway

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References

https://support.konghq.com/support/s/article/CVE-2026-6338