CVE-2026-42583

HIGH EPSS 34.3%

Published May 13, 20261mo ago · Modified Jun 17, 20261w ago

7.5 CVSS 3.1

High

Published May 13, 2026 1mo ago

Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score

7.5

Exploitability

3.9

Impact

3.6

Vector string

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

Threat Intelligence

EPSS Exploit Probability

34.3% percentile

Exploit & Patch Status

Public Exploit Known

No Patch Available

Weaknesses 2

CWE-400 Uncontrolled Resource Consumption Resource Mgmt

CWE-770

Affected Products 2

Vendor	Product	Version	Range
netty	netty	*	<4.1.133
netty	netty	*	≥4.2.0 – <4.2.13

References 1

github.com https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6

ExploitVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.