GHSA-jppx-w49h-x2qq
Netty: [SpdyHttpDecoder] ByteBuf Reference Leak on RST_STREAM Leads to Native Memory Exhaustion
Quick fix
GHSA-jppx-w49h-x2qq — io.netty:netty-codec-http: upgrade to the fixed version with the command below.
# pom.xml: bump <version>4.2.16.Final</version> for io.netty:netty-codec-httpDetails
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`, storing the partially-constructed `FullHttpRequest` in an internal map (`messageMap`) to accumulate subsequent `DATA` frames. When the remote peer sends an `RST_STREAM` for that stream, or when the accumulated content exceeds `maxContentLength`, the decoder removes the entry from the map but **never releases the pooled ByteBuf**, permanently leaking the allocated memory.
Are you affected?
Enter the version of the package you're using.
Affected packages
4.2.0.Final Fixed in: 4.2.16.Final # pom.xml: bump <version>4.2.16.Final</version> for io.netty:netty-codec-http 4.1.0.Final Fixed in: 4.1.136.Final # pom.xml: bump <version>4.1.136.Final</version> for io.netty:netty-codec-http References
- https://github.com/netty/netty/security/advisories/GHSA-jppx-w49h-x2qq [WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-56745 [ADVISORY]
- https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b [WEB]
- https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6 [WEB]
- https://github.com/netty/netty [PACKAGE]
- https://github.com/netty/netty/releases/tag/netty-4.1.136.Final [WEB]
- https://github.com/netty/netty/releases/tag/netty-4.2.16.Final [WEB]