gRPC-Go xDS servers: Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21801-1 advisory.

    - CVE-2026-24122: github.com/sigstore/cosign/v2/pkg/cosign: improper validation of certificates that     outlive expired CA       certificates (bsc#1258543).
    - CVE-2026-37236: github.com/grpc-ecosystem/grpc-gateway/v2/runtime: client can override the HTTP method     of a POST       request through the X-HTTP-Method-Override header and bypass established access control (bsc#1278002).
    - CVE-2026-41178: go.opentelemetry.io/otel/baggage, go.opentelemetry.io/otel/propagation: no rejection of     raw-length       headers in baggage parsing allows for DoS via oversized inputs (bsc#1276745).
    - CVE-2026-50163: oras-go: Information disclosure and arbitrary file access via crafted tarball hardlinks     (bsc#1278702).
    - CVE-2026-56854,CVE-2026-56855,CVE-2026-78662: golang.org/x/crypto/ssh: authentication bypass and     deadlocks in the       crypto/ssh library (bsc#1278624).
    - CVE-2026-84303: github.com/grpc/grpc-go: xDS RBAC HTTP filter implementation issue allows for bypass of     authorization       policies via mixed-case or canonical-case header matches (bsc#1279390).
    - CVE-2026-84304: github.com/grpc/grpc-go: heap memory exhaustion via HTTP/2 DATA frame fragmentation     (bsc#1279395).
    - CVE-2026-84445: google.golang.org/grpc: DoS via crash due to missing `:authority` and `Host` headers in     gRPC-Go xDS       servers (bsc#1279392).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21809-1 advisory.

    Update to version 3.21.1:

    - CVE-2026-37236: github.com/grpc-ecosystem/grpc-gateway/v2/runtime: client can override the HTTP method     of a POST       request through the X-HTTP-Method-Override header and bypass established access control (bsc#1277949).
    - CVE-2026-41178: go.opentelemetry.io/otel/baggage: no rejection of raw-length headers in baggage parsing     allows for DoS       via oversized inputs (bsc#1276644).
    - CVE-2026-48978: oras.land/oras-go/v2/registry/remote/auth: Malicious registry can hijack Bearer token     realm to       exfiltrate credentials and refresh tokens (bsc#1270127).
    - CVE-2026-50151: oras-go: Credential forwarding via unvalidated Location header during blob upload     (bsc#1271660).
    - CVE-2026-63308: processing zero-length byte slices in template chart files can trigger an index out-of-     range panic       (bsc#1272402).
    - CVE-2026-84303: github.com/grpc/grpc-go: xDS RBAC HTTP filter implementation issue allows for bypass of     authorization       policies via mixed-case or canonical-case header matches (bsc#1278270).
    - CVE-2026-84304: github.com/grpc/grpc-go: heap memory exhaustion via HTTP/2 DATA frame fragmentation     (bsc#1278273).
    - CVE-2026-84445: google.golang.org/grpc: DoS via crash due to missing `:authority` and `Host` headers in     gRPC-Go xDS       servers (bsc#1278688).
    - gRPC-Go: several issues affecting the xDS RBAC authorization engine and the HTTP/2 transport server     implementation       (bsc#1276514).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
344683	openSUSE 16 Security Update : trivy (openSUSE-SU-2026:21801-1)	Nessus	SuSE Local Security Checks	Local	high
344664	openSUSE 16: helm / helm-bash-completion / helm-fish-completion / etc (openSUSE-SU-2026:21809-1)	Nessus	SuSE Local Security Checks	Local	high

Detections

Analytics

CVE-2026-84445

high

Tenable Plugins

high

high