Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, the HAProxy PROXY protocol v2 codec in netty leaks native or heap memory on every connection when a client sends a syntactically valid header containing nested `PP2_TYPE_SSL` TLVs (type-length-value records) at depth two or greater. The leak occurs on the successful parse path — no exception is thrown, the message fires downstream, the decoder removes itself, and the application releases the `HAProxyMessage` normally. Yet the underlying cumulation buffer (a pooled, potentially direct `ByteBuf` allocated by the channel) remains permanently pinned. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
References
| Link | Resource |
|---|---|
| https://github.com/netty/netty/releases/tag/netty-4.1.135.Final | Release Notes |
| https://github.com/netty/netty/releases/tag/netty-4.2.15.Final | Release Notes |
| https://github.com/netty/netty/security/advisories/GHSA-h2qv-fj59-j46j | Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
15 Jun 2026, 01:56
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Netty netty
Netty |
|
| References | () https://github.com/netty/netty/releases/tag/netty-4.1.135.Final - Release Notes | |
| References | () https://github.com/netty/netty/releases/tag/netty-4.2.15.Final - Release Notes | |
| References | () https://github.com/netty/netty/security/advisories/GHSA-h2qv-fj59-j46j - Vendor Advisory | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.5 |
| CPE | cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* |
12 Jun 2026, 16:18
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-06-12 16:16
Updated : 2026-06-15 01:56
NVD link : CVE-2026-48059
Mitre link : CVE-2026-48059
CVE.ORG link : CVE-2026-48059
JSON object : View
Products Affected
netty
- netty
CWE
CWE-401
Missing Release of Memory after Effective Lifetime