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signers/gcp: update grpc to patched v1.83.2 - #177
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The standalone GCP signer module pins gRPC v1.83.1, which Dependabot alert #20 identifies as affected by GHSA-2v4p-qf9q-27wj (CVE-2026-84445). Upgrade to the patched v1.83.2 and update the required x/net and x/text versions and module checksums.
The reported denial of service affects xDS servers. pdfsign's GCP signer makes outbound KMS requests and has no xDS server path, so this is a preventive dependency update for the next RC rather than a demonstrated pdfsign runtime vulnerability.
Validation, run explicitly in
signers/gcpbecause it is a separate Go module:go test -race ./...pass, covering signing success and KMS error handling.go build ./...,go vet ./...,go mod verify, andgo mod tidy -diffpass.go list -mselects gRPC v1.83.2, x/net v0.58.0, and x/text v0.41.0.git diff --checkpasses.No live GCP credentials or upstream xDS server reproduction were used. The repository's root CI does not exercise nested signer modules.
Addresses Dependabot alert #20.