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.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6 Exploit, Vendor Advisory
- https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6 Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · nettyNVD modified 2026-10-26 17:10
Affected (CPE criteria) 1
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
References 2
- https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6 Exploit, Vendor Advisory
- https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6 Exploit, Vendor Advisory