Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, Netty's HTTP/2-to-HTTP/1.x translation layer (`Http2StreamFrameToHttpObjectCodec` and `InboundHttp2ToHttpAdapter`) fails to deduplicate or validate `Host` headers when an HTTP/2 client supplies both the `:authority` pseudo-header and a literal `host` header in a single HEADERS frame. The translator maps `:authority` to `Host` and separately copies the literal `host` header, producing an `HttpRequest` object containing two `Host` headers with attacker-controlled differing values. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.
References
| Link | Resource |
|---|---|
| https://github.com/netty/netty/releases/tag/netty-4.1.136.Final | Release Notes |
| https://github.com/netty/netty/releases/tag/netty-4.2.16.Final | Release Notes |
| https://github.com/netty/netty/security/advisories/GHSA-c69g-56f8-xwqj | Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
06 Aug 2026, 20:29
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.3 |
| References | () https://github.com/netty/netty/releases/tag/netty-4.1.136.Final - Release Notes | |
| References | () https://github.com/netty/netty/releases/tag/netty-4.2.16.Final - Release Notes | |
| References | () https://github.com/netty/netty/security/advisories/GHSA-c69g-56f8-xwqj - Vendor Advisory | |
| First Time |
Netty netty
Netty |
29 Jul 2026, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-29 18:16
Updated : 2026-08-06 20:29
NVD link : CVE-2026-59900
Mitre link : CVE-2026-59900
CVE.ORG link : CVE-2026-59900
JSON object : View
Products Affected
netty
- netty
CWE
CWE-444
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')