CVE-2026-42583
HIGH7.5EPSS 0.02%Netty Lz4FrameDecoder is vulnerable to resource exhaustion
Published: 5/7/2026Modified: 5/14/2026
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.
Affected packages (3)
- Debian/nettyfrom 0
- Maven/io.netty:netty-codecfrom 0, < 4.1.133.Final
- Maven/io.netty:netty-codec-compressionfrom 0, < 4.2.13.Final
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |