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Medium severity5.3NVD Advisory· Published Jun 12, 2026· Updated Jun 15, 2026

CVE-2026-50560

CVE-2026-50560

Description

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, Netty HTTP/2 max header size handling produces an attack similar to HTTP/2 Rapid Reset. There is a setting in the http2 specification called SETTINGS_MAX_HEADER_LIST_SIZE. When a client sends that setting to Netty, it appears that Netty will behave as follows: read the request; proxy the request to the origin; attempt to produce a response; and create an exception while writing the headers for the response. Functionally, this should be similar to the http2 reset attack, but with a different on-the-wire signature. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-http2Maven
>= 4.2.0.Final, < 4.2.15.Final4.2.15.Final
io.netty:netty-codec-http2Maven
< 4.1.135.Final4.1.135.Final

Affected products

72

Patches

Vulnerability mechanics

References

6

News mentions

0

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