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CVE-2026-42583

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CVE-2026-42583

Published: May 13, 2026

Modified: May 14, 2026

PUBLISHED

CVSS v3.1

7.5

HIGH

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Lz4FrameDecoder allocates a ByteBuf of size decompressedLength (up to 32 MB per block) before LZ4 runs. A peer only needs a 21-byte header plus compressedLength payload bytes - 22 bytes if compressedLength == 1 - to force that allocation. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

VendorProductVersions

netty

netty

affected
>= 4.2.0.Alpha1, < 4.2.13.Final
affected
< 4.1.133.Final

io.netty

netty-codec

affected
< 4.1.133.Final

io.netty

netty-codec-compression

affected
< 4.2.13.Final

Weaknesses (CWE)

CWE-400
CWE-770

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

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