CVE-2026-56745

Netty is a network application framework for development of protocol servers and clients. 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 allocates a pooled `ByteBuf` when processing a client-initiated `SYN_STREAM` frame with `FLAG_FIN=0` and stores the partially constructed `FullHttpRequest` in `messageMap`; when the remote peer sends `RST_STREAM` for that stream or the accumulated content exceeds `maxContentLength`, the decoder removes the entry but does not release the pooled `ByteBuf`, causing native memory exhaustion. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

• CWE-400

• https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003bPatch
• https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6Patch
• https://github.com/netty/netty/releases/tag/netty-4.1.136.FinalRelease Notes
• https://github.com/netty/netty/releases/tag/netty-4.2.16.FinalRelease Notes
• https://github.com/netty/netty/security/advisories/GHSA-jppx-w49h-x2qqVendor Advisory

Published

Jul 21, 2026

Last Modified

Jul 30, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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