check for valid utf 8 in transmitter address

Author: ogtownsend

core/capabilities/ccip/oraclecreator/plugin.go

@@ -7,6 +7,7 @@ import (
 	"io"
 	"strings"
 	"time"
+	"unicode/utf8"
 
 	"github.com/google/uuid"
 	"github.com/prometheus/client_golang/prometheus"
@@ -507,6 +508,15 @@ func (i *pluginOracleCreator) createCCIPProviders(
 		ccipProviderSupported, ok := pluginServices.CCIPProviderSupported[relayID.Network]
 		if ccipProviderSupported && ok {
 			transmitter := i.transmitters[relayID]
+			// Check if the transmitter string is a valid utf-8 string
+			if !utf8.ValidString(transmitter[0]) {
+				i.lggr.Errorw("transmitter transmitter contains invalid UTF-8",
+					"transmitter", transmitter[0],
+					"relayID.Network", relayID.Network,
+					"chainSelector", chainSelector)
+				return nil, fmt.Errorf("transmitter contains invalid UTF-8: %q", transmitter[0])
+
+			}
 			if len(transmitter) == 0 {
 				return nil, errors.New("transmitter list is empty")
 			}

system-tests/lib/go.mod

@@ -32,8 +32,8 @@ require (
 	github.com/pkg/errors v0.9.1
 	github.com/rs/zerolog v1.33.0
 	github.com/scylladb/go-reflectx v1.0.1
-	github.com/smartcontractkit/chainlink-common v0.9.6-0.20250926171641-6cf0b7f2ca4f
 	github.com/smartcontractkit/chain-selectors v1.0.72
+	github.com/smartcontractkit/chainlink-common v0.9.6-0.20250926171641-6cf0b7f2ca4f
 	github.com/smartcontractkit/chainlink-deployments-framework v0.49.0
 	github.com/smartcontractkit/chainlink-evm v0.3.4-0.20250915101441-709f87f7d401
 	github.com/smartcontractkit/chainlink-evm/gethwrappers v0.0.0-20250827130336-5922343458be