CVE-2026-84304

Name	CVE-2026-84304
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1146639

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
golang-google-grpc (PTS)	bookworm	1.33.3-2	vulnerable
	trixie	1.64.0-7	vulnerable
	forky, sid	1.81.1-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
golang-google-grpc	source	(unstable)	(unfixed)			1146639

Notes

[trixie] - golang-google-grpc <no-dsa> (Minor issue)
[bookworm] - golang-google-grpc <postponed> (Limited support)
https://github.com/grpc/grpc-go/security/advisories/GHSA-vp52-pcj8-j9qc
https://github.com/grpc/grpc-go/pull/9331
Fixed by: https://github.com/grpc/grpc-go/commit/7354d9c8debb4bcf2225bf429857078de310c176 (master)
https://github.com/grpc/grpc-go/pull/9333 (v1.83.x backport)
Fixed by: https://github.com/grpc/grpc-go/commit/8cfeca0e1ee5ea0980dcc320e20240fa1079ec77 (v1.83.1)