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CVE-2026-84445— gRPC-Go: Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers in the xDS servers

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组织的一款基于HTTP/2协议的远程过程调用框架。 gRPC-Go 1.82.2之前版本和1.83.0至1.83.2之前版本存在安全漏洞，该漏洞源于服务器接受既无:authority头也无Host头的RPC，而路由处理假设存在authority值并索引空切片，可能导致远程客户端触发越界索引恐慌，进而终止整个服务器进程。

CVSS 8.7 · High EPSS 0.69% · P51

Possible ATT&CK Techniques 2 AI

T1499 · Endpoint Denial of Service T1521

Affected Version Matrix 2

VendorProduct Version RangeStatus
grpc grpc-go < 1.82.2 affected
>= 1.83.0, < 1.83.2 affected
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I. Basic Information for CVE-2026-84445

Vulnerability Information
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Vulnerability Title
gRPC-Go: Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers in the xDS servers
Source: CVE Program / CVE List V5
Vulnerability Description
gRPC-Go is the Go language implementation of gRPC. Prior to 1.82.2 and 1.83.2, servers created with xds.NewGRPCServer() allow internal/transport/http2_server.go to accept an RPC containing neither the :authority header nor the Host header, while RouteAndProcess in internal/xds/server/routing.go assumes that an authority value exists and indexes the empty slice. A remote client that can complete transport connection establishment can trigger an index-out-of-bounds panic that is not recovered by the per-RPC goroutine and terminates the entire server process. In insecure or ordinary TLS deployments the request can be unauthenticated, while strict mTLS or ALTS deployments require valid transport credentials before the malformed RPC can reach the interceptor. This issue is fixed in versions 1.82.2 and 1.83.2.
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
对数组索引的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
gRPC-Go 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
gRPC-Go是grpc组织的一款基于HTTP/2协议的远程过程调用框架。 gRPC-Go 1.82.2之前版本和1.83.0至1.83.2之前版本存在安全漏洞，该漏洞源于服务器接受既无:authority头也无Host头的RPC，而路由处理假设存在authority值并索引空切片，可能导致远程客户端触发越界索引恐慌，进而终止整个服务器进程。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
grpc grpc-go < 1.82.2 -

II. Public POCs for CVE-2026-84445

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III. Intelligence Information for CVE-2026-84445

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Patches & Fixes for CVE-2026-84445 (6)

Vendor Advisories for CVE-2026-84445 (1)

Vendor Pages for CVE-2026-84445 (2)

Other References for CVE-2026-84445 (1)

IV. Related Vulnerabilities

Same product: grpc-go
Same vendor: grpc
Same weakness: CWE-129

V. Comments for CVE-2026-84445

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