chore(trivy): suppress CVE-2026-84304 in embedded grpc (#12720)

.grype.yaml

@@ -17,6 +17,16 @@ ignore:
   - vulnerability: CVE-2026-71556
     package:
       name: github.com/go-git/go-git/v5
+  # CVE-2026-84304 is the same temporary exception documented in .trivyignore.yaml:
+  # Trivy 0.74.0 still embeds grpc 1.82.1, while the 1.83.1 fix is not in any release.
+  # Prowler only runs `trivy image` / `trivy fs`, never client/server mode, so no gRPC
+  # endpoint exists in the image. Pinned to the embedded version so the rule stops
+  # matching on its own once Trivy bumps grpc. Remove with the Trivy exception by 2026-10-15.
+  # https://github.com/aquasecurity/trivy/pull/11176
+  - vulnerability: CVE-2026-84304
+    package:
+      name: google.golang.org/grpc
+      version: v1.82.1
   - vulnerability: CVE-2026-56852
     package:
       name: golang.org/x/text

.trivyignore.yaml

@@ -148,6 +148,22 @@ vulnerabilities:
       - "pkg:golang/github.com/go-git/go-git/v5"
     expired_at: 2026-09-15
 
+  # CVE-2026-84304 is a DoS in grpc-go <= 1.83.0: a peer fragments a gRPC stream into
+  # millions of tiny HTTP/2 DATA frames until the receiver runs out of heap. Fixed in
+  # 1.83.1 (published 2026-09-01). Trivy 0.74.0, the latest published release and the
+  # version the images ship, pins 1.82.1 as an indirect dependency:
+  # https://github.com/aquasecurity/trivy/blob/v0.74.0/go.mod
+  # Upstream bump still open: https://github.com/aquasecurity/trivy/pull/11176
+  # Trivy only speaks gRPC in client/server mode (`trivy server`, `--server`). Prowler
+  # invokes it exclusively as `trivy image` and `trivy fs` on a local path, so no gRPC
+  # listener or connection ever exists in the image and the affected path is not
+  # reachable. Remove this temporary suppression as soon as a Trivy release pins
+  # grpc >= 1.83.1.
+  - id: CVE-2026-84304
+    purls:
+      - "pkg:golang/google.golang.org/grpc"
+    expired_at: 2026-10-15
+
   - id: CVE-2026-56852
     purls:
       - "pkg:golang/golang.org/x/text"