CVE-2026-42583

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6	Exploit Vendor Advisory
https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:netty:netty::::::::
	cpe:2.3:a:netty:netty::::::::

History

26 Oct 2026, 17:10

Type	Values Removed	Values Added
Summary		(es) Netty es un framework de aplicación de red asíncrono y basado en eventos. Antes de 4.2.13.Final y 4.1.133.Final, Lz4FrameDecoder asigna un ByteBuf del tamaño decompressedLength (hasta 32 MB por bloque) antes de que se ejecute LZ4. Un par solo necesita una cabecera de 21 bytes más los bytes de carga útil compressedLength - 22 bytes si compressedLength == 1 - para forzar esa asignación. Esta vulnerabilidad se corrige en 4.2.13.Final y 4.1.133.Final.

Information

Published : 2026-05-13 19:17

Updated : 2026-10-26 17:10

NVD link : CVE-2026-42583

Mitre link : CVE-2026-42583

CVE.ORG link : CVE-2026-42583

JSON object : View

Products Affected

netty

netty

CWE

CWE-400

Uncontrolled Resource Consumption

CWE-770

Allocation of Resources Without Limits or Throttling

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