CVE-2026-42583CWE-400CWE-770

Netty: Lz4FrameDecoder resource exhaustion

High · published May 13, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
41.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00486 · 41.0th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-05-13T18:09Z
EPSS history
Timeline
  • 13 MAY 18:09Z
    Netty: Lz4FrameDecoder resource exhaustion
    cvelistv5