CVE-2026-42583
Netty: Lz4FrameDecoder resource exhaustion
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 CWE-770 |
| Vendor | netty |
| Product | netty |
| Published | May 13, 2026 |
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CVSS v3 Breakdown
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
Affected Versions
netty / netty
>= 4.2.0.Alpha1, < 4.2.13.Final < 4.1.133.Final
io.netty / netty-codec
< 4.1.133.Final
io.netty / netty-codec-compression
< 4.2.13.Final