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.
References (1)
Core 1
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6
Scores
CVSS v3
7.5
EPSS
0.0041
EPSS Percentile
32.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-400
CWE-770
Status
published
Products (7)
io.netty/netty-codec
0 - 4.1.133.FinalMaven
io.netty/netty-codec
< 4.1.133.Final
io.netty/netty-codec-compression
0 - 4.2.13.FinalMaven
io.netty/netty-codec-compression
< 4.2.13.Final
netty/netty
< 4.1.133
netty/netty
< 4.1.133.Final
netty/netty
>= 4.2.0.Alpha1, < 4.2.13.Final
Published
May 13, 2026
Tracked Since
May 14, 2026