CVE-2026-50011: Netty: Unbounded pre-allocation in RedisArrayAggregator from RESP array length

June 15, 2026

RedisArrayAggregator pre-allocates ArrayList with initial capacity equal to the RESP array element count declared in an array header. That count is taken from the wire before the corresponding child messages exist. A small malicious header can claim a huge initial capacity.

References

github.com/advisories/GHSA-5w86-c3rq-vjj7
github.com/netty/netty/releases/tag/netty-4.1.135.Final
github.com/netty/netty/releases/tag/netty-4.2.15.Final
github.com/netty/netty/security/advisories/GHSA-5w86-c3rq-vjj7
nvd.nist.gov/vuln/detail/CVE-2026-50011

Code Behaviors & Features

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