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io.netty:netty-codec-http

netty

A vulnerability in Netty's SPDY-to-HTTP codec (SpdyHttpDecoder handler) in versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final causes a pooled ByteBuf memory leak when processing client-initiated SYN_STREAM frames. This occurs when an RST_STREAM frame is received or the content length exceeds a limit, leading to native memory exhaustion.

The SpdyHttpDecoder handler in Netty's SPDY-to-HTTP codec has a vulnerability that causes a pooled ByteBuf memory leak during the processing of client-initiated SYN_STREAM frames. Specifically, when an RST_STREAM frame is received or when the content length exceeds a configured limit, the allocated ByteBuf is removed from internal tracking but not released, resulting in native memory exhaustion. This affects Netty versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, as well as several specific package versions listed. The CVSS v3.1 score is 7.5, indicating a medium severity with network attack vector, low complexity, no privileges required, no user interaction, and an impact limited to availability.

Detailed information about Io.netty:netty codec http: Netty: [SpdyHttpDecoder] ByteBuf Reference Leak on RST_STREAM Leads to Native Memory Exhaustion (CVE-2026-

Io.netty:netty codec http: Netty: [SpdyHttpDecoder] ByteBuf Reference Leak on RST_STREAM Leads to Native Memory Exhaustion (CVE-2026-56745) - Live Threat Intelligence - Threat Radar | OffSeq.com

In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, the SpdyHttpDecoder handler in Netty's SPDY-to-HTTP codec… (CVE-2026-56745)

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