Vulnerability · Published Jun 11, 2026 · Assigned by Kong
CVE-2026-6338HTTP request smuggling in Kong Enteprise Gateway
Medium 4.9
In plain English
A medium-severity security flaw in Kong Enterprise Gateway from Kong. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).
Severity (CVSS 4.0)4.9Medium
Exploit odds (30 days)0.3%top 78.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Kong | Kong Enterprise Gateway | 3.4.0.0 – before 3.4.3.273.10.0.0 – before 3.10.0.123.11.0.0 – before 3.11.0.123.12.0.0 – before 3.12.0.73.13.0.0 – before 3.13.0.53.14.0.0 – before 3.14.0.4 |
Weakness: CWE-444 · 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
References
- https://support.konghq.com/support/s/article/CVE-2026-6338 vendor-advisory