Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In netty-codec-compression versions 4.1.124.Final and below, and netty-codec versions 4.2.4.Final and below, when supplied with specially crafted input, BrotliDecoder and certain other decompression decoders will allocate a large number of reachable byte buffers, which can lead to denial of service. BrotliDecoder.decompress has no limit in how often it calls pull, decompressing data 64K bytes at a time. The buffers are saved in the output list, and remain reachable until OOM is hit. This is fixed in versions 4.1.125.Final of netty-codec and 4.2.5.Final of netty-codec-compression.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/netty/netty/commit/9d804c54ce962408ae6418255a83a13924f7145d Patch
- https://github.com/netty/netty/security/advisories/GHSA-3p8m-j85q-pgmj 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 6.9 · nettyNVD modified 2026-10-19 17:10
Affected (CPE criteria) 1
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*