Netty HAProxy: Unbalanced Reference Count in Nested PP2_TYPE_SSL TLV Parsing Leads to Memory Exhaustion

CAO 7.5CVE-2026-48059 · GHSA-h2qv-fj59-j46j · Công bố 12/06/2026 · cập nhật 18/09/2026

Tóm tắt nhanh

CVE-2026-48059 là lỗ hổng mức CAO (CVSS 7.5) ảnh hưởng io.netty:netty-codec-haproxy, netty (netty).
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.63%, cao hơn 50.2% các lỗ hổng khác.
Cách xử lý: cập nhật lên 4.2.15.Final, 4.1.135.Final, 4.2.15, 4.1.135 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
io.netty:netty-codec-haproxy Maven	`≥ 4.2.0.Final, < 4.2.15.Final< 4.1.135.Final`	`4.2.15.Final4.1.135.Final`
netty netty	`≥ 4.2.0, < 4.2.15< 4.1.135`	`4.2.154.1.135`

Mô tả

Impact

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.

Mô tả của NVD

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.