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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact High

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00048.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Kong Kong Enterprise Gateway unaffected
Version Status Constraints
3.4.0.0 affected < 3.4.3.27
3.10.0.0 affected < 3.10.0.12
3.11.0.0 affected < 3.11.0.12
3.12.0.0 affected < 3.12.0.7
3.13.0.0 affected < 3.13.0.5
3.14.0.0 affected < 3.14.0.4

No data.

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://support.konghq.com/support/s/article/CVE-2026-6338 cve-icon cve-icon
History

Fri, 12 Jun 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Kong
Kong kong Enterprise Gateway
Vendors & Products Kong
Kong kong Enterprise Gateway

Thu, 11 Jun 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 11 Jun 2026 14:15:00 +0000

Type Values Removed Values Added
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.
Title HTTP request smuggling in Kong Enteprise Gateway
Weaknesses CWE-444
References
Metrics cvssV4_0

{'score': 4.9, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Kong

Published:

Updated: 2026-06-11T14:23:21.941Z

Reserved: 2026-04-15T10:07:35.856Z

Link: CVE-2026-6338

cve-icon Vulnrichment

Updated: 2026-06-11T14:23:17.549Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-06-11T14:16:32.553

Modified: 2026-06-11T15:32:52.983

Link: CVE-2026-6338

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-12T20:18:04Z

Weaknesses