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High severity7.5GHSA Advisory· Published Jun 12, 2026· Updated Jun 15, 2026

CVE-2026-46340

CVE-2026-46340

Description

Netty is a network application framework for development of protocol servers and clients. In versions of netty-transport-sctp prior to 4.1.135.Final and 4.2.15.Final, for each non-complete SctpMessage fragment the handler does fragments.put(streamId, Unpooled.wrappedBuffer(frag, byteBuf)), wrapping the previous accumulator and the new slice into a *new* CompositeByteBuf every time. After N fragments the accumulator is an N-deep chain of composites, each holding references and component arrays; readableBytes()/getBytes() on the final buffer recurse N levels. There is no limit on N, on total bytes, or on the number of streamIdentifiers an attacker can open (each gets its own map entry). A peer that never sets the complete flag can grow this structure indefinitely from tiny 1-byte DATA chunks. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

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

Affected products

35

Patches

Vulnerability mechanics

References

5

News mentions

1