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CVE-2026-6338

HTTP request smuggling in Kong Enteprise Gateway

MEDIUM
4.9
CVSS Score
Published: June 11, 2026 at 01:47 PM UTC
Updated: October 26, 2026 at 11:10 AM UTC
1 product affected across 1 vendorEnterprise Gateway

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Severity
MEDIUM4.9
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Enterprise Gateway· Kong
90%
3.10.0.0 ≤ v < 3.10.0.123.11.0.0 ≤ v < 3.11.0.123.12.0.0 ≤ v < 3.12.0.73.13.0.0 ≤ v < 3.13.0.53.14.0.0 ≤ v < 3.14.0.43.4.0.0 ≤ v < 3.4.3.273.10.0.03.11.0.03.12.0.03.13.0.03.14.0.03.4.0.0
Affected range stops below 3.10.0.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.11.0.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.12.0.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.13.0.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.14.0.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.4.3.27, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://support.konghq.com/support/s/article/CVE-2026-6338

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.9MEDIUMKong
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-444

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