PT-2026-38360 · Netty · Netty

Published 2026-05-07 · Updated 2026-05-07 · CVE-2026-42583

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Netty (affected versions not specified)

Description A resource exhaustion issue exists in the decode() function of the io.netty.handler.codec.compression.Lz4FrameDecoder class. The decoder trusts header fields to determine buffer sizing, specifically allocating a ByteBuf based on the decompressedLength variable (which can reach up to 32 MB per block) before the LZ4 decompression process begins. An attacker can trigger this large allocation by sending a small payload consisting of a 21-byte header plus compressedLength payload bytes. This allows untrusted senders to stress system memory by sending numerous small requests if per-channel or aggregate limits are not implemented.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Resource Exhaustion

Allocation of Resources Without Limits

Weakness Enumeration

CWE-400

CWE-770

Related Identifiers

CVE-2026-42583

GHSA-MJ4R-2HFC-F8P6

Affected Products

Netty

References · 4

• https://osv.dev/vulnerability/GHSA-mj4r-2hfc-f8p6 · Vendor Advisory
• https://github.com/netty/netty · Note
• https://twitter.com/dailycve/status/2052223984641376275 · Twitter Post
• https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6 · Note