Vulnerability · Published Sep 1, 2026 · Assigned by GitHub_M
CVE-2026-84304gRPC-Go: Heap Memory Exhaustion (OOM) via HTTP/2 DATA Frame Fragmentation
High 8.7
In plain English
A high-severity uncontrolled resource consumption in grpc-go from grpc. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | golang-google-grpc | no fix listed | DEBIAN-CVE-2026-84304 |
| Debian:13 | golang-google-grpc | no fix listed | DEBIAN-CVE-2026-84304 |
| Debian:14 | golang-google-grpc | no fix listed | DEBIAN-CVE-2026-84304 |
| Go | google.golang.org/grpc | 1.83.1 | GHSA-vp52-pcj8-j9qc |
| Go | google.golang.org/grpc | 1.83.1 | GO-2026-6348 |
| Ubuntu:22.04:LTS | golang-google-grpc | no fix listed | UBUNTU-CVE-2026-84304 |
| Ubuntu:26.04:LTS | golang-google-grpc | no fix listed | UBUNTU-CVE-2026-84304 |
| Ubuntu:26.10 | golang-google-grpc | no fix listed | UBUNTU-CVE-2026-84304 |
| Ubuntu:22.04:LTS | google-guest-agent | no fix listed | UBUNTU-CVE-2026-84304 |
| Ubuntu:24.04:LTS | google-guest-agent | no fix listed | UBUNTU-CVE-2026-84304 |
| Ubuntu:26.04:LTS | google-guest-agent | no fix listed | UBUNTU-CVE-2026-84304 |
| Ubuntu:26.10 | google-guest-agent | no fix listed | UBUNTU-CVE-2026-84304 |
Affected products (as reported)
Weakness: CWE-400 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/grpc/grpc-go/security/advisories/GHSA-vp52-pcj8-j9qc x_refsource_CONFIRM
- https://github.com/grpc/grpc-go/pull/9331 x_refsource_MISC
- https://github.com/grpc/grpc-go/pull/9333 x_refsource_MISC
- https://github.com/grpc/grpc-go/commit/7354d9c8debb4bcf2225bf429857078de310c176 x_refsource_MISC
- https://github.com/grpc/grpc-go/commit/8cfeca0e1ee5ea0980dcc320e20240fa1079ec77 x_refsource_MISC
- https://github.com/grpc/grpc-go/releases/tag/v1.83.1 x_refsource_MISC