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High severity7.5NVD Advisory· Published Jul 21, 2026· Updated Jul 23, 2026

CVE-2026-55831

CVE-2026-55831

Description

Netty is a network application framework for development of protocol servers and clients. Prior to 4.1.136.Final and 4.2.16.Final, Netty's SPDY SETTINGS decoder accepts a peer-declared SETTINGS entry count up to the 24-bit frame-length limit and materializes every unique setting ID in DefaultSpdySettingsFrame, allowing a remote SPDY/3.1 peer to send a syntactically valid roughly 2 MiB SETTINGS frame that creates 262144 map entries and amplifies network input into heap growth and ordered-map insertion work. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-httpMaven
>= 4.2.0.Final, < 4.2.16.Final4.2.16.Final
io.netty:netty-codec-httpMaven
>= 4.1.0.Final, < 4.1.136.Final4.1.136.Final

Affected products

243

Patches

Vulnerability mechanics

References

7

News mentions

0

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