diff --git a/cmd/evm/internal/t8ntool/transaction.go b/cmd/evm/internal/t8ntool/transaction.go
index 28329e9611..4faca69cf7 100644
--- a/cmd/evm/internal/t8ntool/transaction.go
+++ b/cmd/evm/internal/t8ntool/transaction.go
@@ -133,8 +133,14 @@ func Transaction(ctx *cli.Context) error {
 			r.Address = sender
 		}
 		// Check intrinsic gas
+		value, overflow := uint256.FromBig(tx.Value())
+		if overflow {
+			// A 256-bit overflow is reported by the field validation below; use a
+			// non-zero placeholder so intrinsic gas is still computed and reported.
+			value = uint256.NewInt(1)
+		}
 		rules := chainConfig.Rules(common.Big0, true, 0)
-		cost, err := core.IntrinsicGas(tx.Data(), tx.AccessList(), tx.SetCodeAuthorizations(), r.Address, tx.To(), uint256.MustFromBig(tx.Value()), rules, params.CostPerStateByte)
+		cost, err := core.IntrinsicGas(tx.Data(), tx.AccessList(), tx.SetCodeAuthorizations(), r.Address, tx.To(), value, rules, params.CostPerStateByte)
 		if err != nil {
 			r.Error = err
 			results = append(results, r)
diff --git a/core/txpool/validation.go b/core/txpool/validation.go
index 404e350468..642b27570f 100644
--- a/core/txpool/validation.go
+++ b/core/txpool/validation.go
@@ -125,9 +125,14 @@ func ValidateTransaction(tx *types.Transaction, head *types.Header, signer types
 	if tx.Nonce()+1 < tx.Nonce() {
 		return core.ErrNonceMax
 	}
+	// Sanity check for extremely large numbers (supported by RLP or RPC)
+	value, overflow := uint256.FromBig(tx.Value())
+	if overflow {
+		return core.ErrInsufficientFunds
+	}
 	// Ensure the transaction has more gas than the bare minimum needed to cover
 	// the transaction metadata
-	intrGas, err := core.IntrinsicGas(tx.Data(), tx.AccessList(), tx.SetCodeAuthorizations(), from, tx.To(), uint256.MustFromBig(tx.Value()), rules, params.CostPerStateByte)
+	intrGas, err := core.IntrinsicGas(tx.Data(), tx.AccessList(), tx.SetCodeAuthorizations(), from, tx.To(), value, rules, params.CostPerStateByte)
 	if err != nil {
 		return err
 	}
diff --git a/tests/transaction_test_util.go b/tests/transaction_test_util.go
index 7cf2ac66cf..c87b6988ce 100644
--- a/tests/transaction_test_util.go
+++ b/tests/transaction_test_util.go
@@ -82,7 +82,11 @@ func (tt *TransactionTest) Run() error {
 			return
 		}
 		// Intrinsic cost
-		cost, err := core.IntrinsicGas(tx.Data(), tx.AccessList(), tx.SetCodeAuthorizations(), sender, tx.To(), uint256.MustFromBig(tx.Value()), rules, params.CostPerStateByte)
+		value, overflow := uint256.FromBig(tx.Value())
+		if overflow {
+			return sender, hash, 0, errors.New("value exceeds 256 bits")
+		}
+		cost, err := core.IntrinsicGas(tx.Data(), tx.AccessList(), tx.SetCodeAuthorizations(), sender, tx.To(), value, rules, params.CostPerStateByte)
 		if err != nil {
 			return
 		}