CVE-2026-84445gRPC-Go: Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers in the xDS servers
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.7 HIGH (v4.0, CNA)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
- Weakness (CWE)
- CWE-129, CWE-248
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
grpc grpc-go grpc:go (from the name) | before 1.82.2; from 1.83.0, < 1.83.2 | CNA record |
References
- https://github.com/grpc/grpc-go/security/advisories/GHSA-2v4p-qf9q-27wjx-refsource-confirm
- https://github.com/grpc/grpc-go/issues/9354x-refsource-misc
- https://github.com/grpc/grpc-go/pull/9365x-refsource-misc
- https://github.com/grpc/grpc-go/pull/9366x-refsource-misc
- https://github.com/grpc/grpc-go/pull/9367x-refsource-misc
- https://github.com/grpc/grpc-go/commit/3822494d8ea03b992c089fd2a195f041762fffb7x-refsource-misc
- https://github.com/grpc/grpc-go/commit/8668b69c167df908b6b3666dcbf40992b9e932a4x-refsource-misc
- https://github.com/grpc/grpc-go/commit/93e31b48545e2a8aaeb6e06b47fb249f94e6297fx-refsource-misc
- https://github.com/grpc/grpc-go/releases/tag/v1.82.2x-refsource-misc
- https://github.com/grpc/grpc-go/releases/tag/v1.83.2x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.