CVE-2026-6338

Medium

Description

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.

SeverityMedium

CVSS4.9

Exploit probability—

Product

Kong Enterprise Gateway

PublishedJun 11, 2026

First seenJun 11, 2026

Weakness typeCWE-444CWE-444

How to fix

Update

Kong Kong Enterprise Gateway3.4.3.27, 3.10.0.12, 3.11.0.12, 3.12.0.7, 3.13.0.5, 3.14.0.4 or later

Vendor advisories

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

Affected products

Product	Affected versions	Fixed in
Kong Kong Enterprise Gateway	3.4.0.0 ≤ v < 3.4.3.27, 3.10.0.0 ≤ v < 3.10.0.12, 3.11.0.0 ≤ v < 3.11.0.12, 3.12.0.0 ≤ v < 3.12.0.7, 3.13.0.0 ≤ v < 3.13.0.5, 3.14.0.0 ≤ v < 3.14.0.4	3.4.3.27, 3.10.0.12, 3.11.0.12, 3.12.0.7, 3.13.0.5, 3.14.0.4

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