🚨 CVE-2026-84304
gRPC-Go is the Go language implementation of gRPC. Prior to 1.83.1, internal/transport/transport.go stores each fragmented HTTP/2 DATA frame as a separate recvMsg in recvBuffer, so millions of one-byte frames can consume disproportionate heap memory even when payload bytes remain within connection and stream flow-control windows. An unauthenticated remote attacker can use concurrent multiplexed streams to exhaust process memory and cause a runtime panic or out-of-memory termination. Receive-buffer compaction is enabled by default and can be controlled temporarily with GRPC_GO_EXPERIMENTAL_ENABLE_RECEIVE_BUFFER_COMPACTION. This issue is fixed in version 1.83.1.
🎖@cveNotify
GitHub
transport: restrict memory overhead of buffering small data frames (#… · grpc/grpc-go@7354d9c
…9331)
RELEASE NOTES:
* transport: restrict memory overhead of buffering small data frames.
September 1, 2026 20 1
