HTTP request smuggling in Kong Enteprise Gateway

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Summary

CVECVE-2026-6338
StatePUBLISHED
AssignerKong
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-11 14:16:32 UTC
Updated2026-06-11 15:32:52 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v4.0 4.9 MEDIUM from 02762ae7-200e-4b20-9b2b-a77d5b8fc4cb

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:A/V:X/RE:M/U:X

Problem Types: CWE-444 | CWE-444 CWE-444 Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling')

VersionSourceTypeScoreSeverityVector
4.002762ae7-200e-4b20-9b2b-a77d5b8fc4cbSecondary4.9MEDIUMCVSS: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/C...
4.0CNACVSS4.9MEDIUMCVSS: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...

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
None
Sub Conf.
High
Sub Integrity
High
Sub Availability
None

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:A/V:X/RE:M/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Kong Kong Enterprise Gateway affected 3.4.0.0 3.4.3.27 kong enteprise gateway 3.4 Linux
CNA Kong Kong Enterprise Gateway affected 3.10.0.0 3.10.0.12 kong enteprise gateway 3.10 Linux
CNA Kong Kong Enterprise Gateway affected 3.11.0.0 3.11.0.12 kong enteprise gateway 3.11 Linux
CNA Kong Kong Enterprise Gateway affected 3.12.0.0 3.12.0.7 kong enteprise gateway 3.12 Linux
CNA Kong Kong Enterprise Gateway affected 3.13.0.0 3.13.0.5 kong enteprise gateway 3.13 Linux
CNA Kong Kong Enterprise Gateway affected 3.14.0.0 3.14.0.4 kong enteprise gateway 3.14 Linux

References

ReferenceSourceLinkTags
support.konghq.com/support/s/article/CVE-2026-6338 02762ae7-200e-4b20-9b2b-a77d5b8fc4cb support.konghq.com
CVE Program record CVE.ORG www.cve.org canonical
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