CVE-2026-84445

Name	CVE-2026-84445
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 (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

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)

Notes

https://github.com/grpc/grpc-go/security/advisories/GHSA-2v4p-qf9q-27wj
https://github.com/grpc/grpc-go/issues/9354
https://github.com/grpc/grpc-go/pull/9365
Fixed by: https://github.com/grpc/grpc-go/commit/93e31b48545e2a8aaeb6e06b47fb249f94e6297f (master)
https://github.com/grpc/grpc-go/pull/9366 (v1.83.x backports)
Fixed by: https://github.com/grpc/grpc-go/commit/8668b69c167df908b6b3666dcbf40992b9e932a4 (v1.83.2)
https://github.com/grpc/grpc-go/pull/9367 (v1.82.x backports)
Fixed by: https://github.com/grpc/grpc-go/commit/3822494d8ea03b992c089fd2a195f041762fffb7 (v1.82.2)