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CVE-2026-42583

Netty: Lz4FrameDecoder resource exhaustion PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
netty / nettyaffected >= 4.2.0.Alpha1, < 4.2.13.Final; affected < 4.1.133.Final
io.netty / netty-codecaffected < 4.1.133.Final
io.netty / netty-codec-compressionaffected < 4.2.13.Final

CWE

CWE-400, CWE-770

References

ADP enrichment

CISA-ADP

No English description supplied.