CVE-2026-42583
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 products
- Confluence, Netty, Red Os
- Netty
- < 4.1.133, 4.2.13
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 0.4% (35th percentile)
- Weakness
- CWE-770, CWE-400
- NVD status
- Analyzed
- Published
- 2026-05-13
CVE-2026-42583 at NVD
No indexed exploits for CVE-2026-42583 yet
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No exploit for CVE-2026-42583 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.