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CVE-2026-6338

HTTP request smuggling in Kong Enteprise Gateway

Medium4.9EPSS 0.29%
Published
Updated
Reserved
Assigned by
Kong

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.

Scores

CVSS scores of CVE-2026-6338, by who scored it
Scored byCVSSScoreVector
KongCNA (assigner)4.0Medium4.9CVSS: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
NVDNVD · Awaiting Analysis4.0Medium4.9CVSS: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
EPSS (exploitation in 30 days)
0.29% · top 79% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.9.

Weakness

Affected products

  • Kong · Kong Enterprise Gateway

    • affected 3.4.0.0 – < 3.4.3.27
    • affected 3.10.0.0 – < 3.10.0.12
    • affected 3.11.0.0 – < 3.11.0.12
    • affected 3.12.0.0 – < 3.12.0.7
    • affected 3.13.0.0 – < 3.13.0.5
    • affected 3.14.0.0 – < 3.14.0.4

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .