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GHSA-6jv9-x5w9-2ccm

Netty's Lack of Lifecycle Cleanup Leads to Pooled ByteBuf Leak in RedisArrayAggregator

Source: GitHub Advisory Database (reviewed) High CVE-2026-48006

Packages

EcosystemPackageAffectedFixed in
Maven io.netty:netty-codec-redis >= 4.2.0.Final, < 4.2.15.Final 4.2.15.Final
Maven io.netty:netty-codec-redis < 4.1.135.Final 4.1.135.Final

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact The RedisArrayAggregator handler permanently leaks pooled direct-memory buffers when a Redis pipeline connection closes before a RESP array aggregate completes. The handler retains child messages in per-handler state (`depths` field) but defines no `channelInactive`, `handlerRemoved`, or `exceptionCaught` method to release them when the pipeline tears down. Because the leaked buffers are slices of `PooledByteBufAllocator` chunks, they prevent those chunks from being returned to the JVM-wide direct-memory pool. Repeated connection churn by any network peer monotonically drains this shared pool, eventually causing allocation failures on all Netty channels in the process.

References

External links from the advisory. They lead to third-party sites.