CVE-2026-84304: Grpc Grpc-Go

High severity, CVSS 8.7. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Grpc Grpc-Go: before 1.83.1 (fixed in 1.83.1)

Published 2026-09-01. Last modified 2026-09-09.