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CVE-2026-84304— gRPC-Go: Heap Memory Exhaustion (OOM) via HTTP/2 DATA Frame Fragmentation

Quick assessment

Affected
grpc grpc-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

gRPC-Go 是 gRPC 的 Go 语言实现。在 1.83.1 版本之前， 会将每个分片的 HTTP/2 DATA 帧作为独立的 存储在 中。因此，即使有效载荷字节数仍位于连接和流控窗口之内，数百万个单字节帧也会不成比例地消耗大量堆内存。未经身份验证的远程攻击者可以利用并发的多路复用流来耗尽进程内存，从而引发运行时恐慌（runtime panic）或因内存不足而终止进程。接收缓冲区的压缩功能默认启用，并可通过环境变量 进行临时控制。该问题已在 1.83.1 版本中修复。

CVSS 8.7 · High

Possible ATT&CK Techniques 2 AI

T1004 T1024

Affected Version Matrix 1

VendorProduct Version RangeStatus
grpc grpc-go < 1.83.1 affected
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I. Basic Information for CVE-2026-84304

Vulnerability Information
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Vulnerability Title
gRPC-Go: Heap Memory Exhaustion (OOM) via HTTP/2 DATA Frame Fragmentation
Source: CVE Program / CVE List V5
Vulnerability 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 Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
grpc grpc-go < 1.83.1 -

II. Public POCs for CVE-2026-84304

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III. Intelligence Information for CVE-2026-84304

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Patches & Fixes for CVE-2026-84304 (3)

Vendor Advisories for CVE-2026-84304 (1)

Vendor Pages for CVE-2026-84304 (1)

IV. Related Vulnerabilities

Same product: grpc-go
Same vendor: grpc
Same weakness: CWE-400

V. Comments for CVE-2026-84304

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